跟读练习: Gallstones (cholelithiasis) - 通过视频学习英语口语
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What?
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you Gallstones are hard deposits, or simply stones, that form inside the gallbladder.
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This condition is also known by the Greek name cholelithiasis.
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"Kola" means bile, "lith" comes from the word lithos meaning stone, and "iasis" refers to an abnormal condition in the body.
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Put it all together and cholelithiasis means having bile stones.
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Now, picture yourself enjoying a creamy plate of Greek Musica.
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As those fats move through your digestive system, they finally reach the small intestine.
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But fats are difficult to process, and that's where the small, pear -shaped organ gallbladder steps in.
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The gallbladder acts as a storage tank for bile produced by the liver.
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The liver carefully blends this digestive smoothie with just the right mix of bile salts, phospholipids, cholesterol, and bilirubin.
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The liver starts the recipe by converting cholesterol into bile acids such as cholic acid.
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Then it mixes these bile acids with amino acids like taurine to create water -soluble bile salts
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that flow smoothly into the bile.
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But not all cholesterol takes this path.
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Some slip directly into bile as free cholesterol, where it mixes with bile salts and phospholipids like lecithin.
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These ingredients act like tiny detergents, wrapping around cholesterol molecules to keep them from crystallizing and clumping.
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Another key ingredient in bile is bilirubin, which comes from the natural breakdown of red blood cells.
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When red blood cells reach the end of their life, they release hemoglobin, which is further broken down into heme and globin.
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The body converts heme into biliverdin and biliverdin to unconjugated bilirubin.
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However, unconjugated bilirubin isn't water -soluble, so it binds to albumin to hitch a ride to the liver.
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In the liver, the body transforms unconjugated bilirubin into water -soluble conjugated bilirubin ready for excretion into bile.
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The liver produces bile continuously, sending it either directly to the small intestine or to the gallbladder for storage.
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The gallbladder walls, which are lined and coated with protective mucus, absorb water and electrolytes, concentrating the bile up to 10 times its original strength.
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Most of the time, the liver blends this bile smoothie perfectly.
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But sometimes, things go off the recipe.
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the bile becomes too thick, or the gallbladder doesn't empty as it should.
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That's when gallstones form, and depending on their main ingredient, they can be cholesterol stones and pigmented stones.
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Cholesterol stones are the most common ones, and they develop exclusively in the gallbladder for several reasons.
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The main one is supersaturation with cholesterol, which happens when the bile recipe is off.
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Basically, the liver adds too much free cholesterol, but not enough bile salts and phospholipids.
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It's like pouring too much protein powder into your smoothie.
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Instead of blending smoothly, it starts to clump together.
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The second reason is gallbladder stasis, also known as gallbladder hypomotility, which means the gallbladder isn't contracting the way it should.
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Just like a smoothie that sits out too long and starts to separate, a stagnant bile gives cholesterol molecules time to clump together.
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Finally, the gallbladder can produce more mucus than it should.
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This thick layer creates the perfect environment to trap cholesterol crystals, allowing them to clump together.
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It's like adding too much syrup to your smoothie.
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As cholesterol crystals clump together within the gallbladder, they slowly grow into oval and firm cholesterol stones.
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Sometimes there's just one, but more often there are several stones lying side by side.
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As they grow, they press against each other and develop flat, smooth surfaces where they touch.
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When made of pure cholesterol, cholesterol stones have a pale yellow color.
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However, they can also pick up substances such as calcium carbonate, phosphates, and bilirubin, so their color can range from gray to white or even black.
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On the other hand, pigment stones make up a smaller portion of gallstones and can appear anywhere along the biliary tree.
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These stones come in two colors and form when bile contains too much unconjugated bilirubin.
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Black pigment stones usually form in the sterile bile of the gallbladder and develop in people with chronic hemolytic anemias.
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In these individuals, high levels of unconjugated bilirubin overwhelm the liver's ability to process it.
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As a result, unconjugated bilirubin, along with conjugated, appears in bile.
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Unconjugated bilirubin binds with calcium to form black stones made of calcium bilirubinate, which are usually small, numerous, and fragile to the touch.
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Next, brownstones usually form in people with biliary tract infections, such as liver flukes.
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These pathogens often release an enzyme called beta -glucuronidase, which converts conjugated bilirubin back into its unconjugated form.
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This unconjugated bilirubin then binds with calcium, leading to the formation of brownstones made of calcium bilirubinate.
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Sometimes they can also include other calcium salts and cholesterol.
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Compared to black stones, brown stones are usually fewer in number and softer, with a greasy, soap -like texture.
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This soapy feel comes from another enzyme released by pathogens.
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It's called phospholipase, which breaks down phospholipids and enables the formation of calcium salts of fatty acids.
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Several factors can tip the balance toward stone formation.
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and you can use the mnemonic "magics" to remember them.
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M stands for metabolic factors, like obesity.
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A stands for age as risk increases with age, and G represents gallbladder stasis, like an individual's on total parenteral nutrition.
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Next, I stands for inherited because family history is a risk factor.
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C stands for childbearing and oral contraceptives, both of which are associated with elevated estrogen levels.
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Finally, "S" refers to sex because biologically female individuals have a higher risk, again thanks to estrogen activity.
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Most of the time, gallstones stay silent.
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But for some, that calm can be shattered by biliary colic, unleashing sharp, intense pain in the upper right abdomen or just below the ribs.
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Biliary colic typically follows a fatty meal, as fat triggers the gallbladder to contract, pushing a stone against its outlet and causing pressure to build.
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As pressure rises, the gallbladder walls stretch, making the pain peak within 15 to 60 minutes.
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The pain holds steady for one to four hours before gradually easing as the stone shifts back or passes through the duct.
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Often, symptoms like nausea, vomiting, and sweating accompany biliary colic, while people typically feel normal between episodes.
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Diagnosis primarily relies on abdominal ultrasound, which identifies gallbladder stones in over 90 % of cases.
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Ultrasound may also show bile duct dilation if a stone has recently passed or is still present.
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Abdominal x -ray can be done if the cause of the pain is uncertain, but most cholesterol stones are radiolucent and don't show up.
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However, if they contain calcium salts, such as calcium carbonate, they become radiopaque and visible.
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Similarly, black pigment stones contain high concentrations of calcium bilirubinate, which makes them radiopaque, while brown pigment stones contain calcium salts of fatty acids,
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which makes them radiolucent.
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If needed, you can turn to more advanced tools like Magnetic Resonance Cholangiopancreatography, which maps the bile ducts and identifies stones as filling defects.
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Also, during the endoscopic retrograde cholangiopancreatography, you can inject dye into the bile ducts and take x -rays to locate stones.
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If present, you can remove them during the same procedure.
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Most gallstones don't cause symptoms, so surgery is usually not worth the risks unless they start causing problems.
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When symptoms do occur, the go -to treatment is laparoscopic cholecystectomy, which is the surgical removal of the gallbladder through small cuts with the help of a tiny camera.
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For individuals who can't have surgery, alternatives include medications that help dissolve the stones, like ursodeoxycholic acid.
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Alright, as a quick recap: Gallstones, or colovithiasis, form when substances in bile,
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primarily cholesterol or unconjugated bilirubin, crystallize within the gallbladder.
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Cholesterol stones develop if there's too much cholesterol or insufficient bile salts, while pigment stones arise when excess unconjugated bilirubin binds calcium,
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often due to increased red blood cell breakdown or infections.
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本课的词汇与口语要点
这段视频共有 89 个句子、1339 个单词可供跟读。 讲话部分时长为 10:13。 说话人语速平稳，每分钟约 131 个词，很适合跟读。 只有 65% 的单词属于英语最常用的 3,000 词，词汇难度较高。
视频中的重点词汇
视频中 15 个值得学习的单词，附发音和释义：
| 单词 | 发音 | 释义 |
|---|---|---|
| boil 动词 | /bɔɪ(ə)l/ | 煮沸, 煮 |
| cholesterol 名词 | /kəˈlɛstəɹɒl/ | 膽固醇 /胆固醇 |
| calcium 名词 | /ˈkælsi.əm/ | 鈣 /钙 |
| acid 名词 | /ˈæsɪd/ | 酸 |
| duct 名词 | /dʌkt/ | 管, 管子 |
| ingredient 名词 | /ɪnˈɡɹiːdi.ənt/ | 成份, 材料 |
| symptom 名词 | /ˈsɪm(p)təm/ | 症狀 /症状, 病徵 /病征 |
| thick 形容词 | /θɪk/ | ху, 厚 |
| refer 动词 | /ɹɪˈfɜː/ | 談到 /谈到 |
| crystal 名词 | /ˈkɹɪstəl/ | 結晶 /结晶 |
| infection 名词 | /ɪnˈfɛkʃən/ | 傳染 /传染 |
| substance 名词 | /ˈsʌbstəns/ | 物質 /物质 |
| breakdown 名词 | /ˈbɹeɪkˌdaʊn/ | 故障 |
| enzyme 名词 | /ˈɛn.zaɪm/ | 酶, 酵素 |
| molecule 名词 | /ˈmɑ.lɪ.kjul/ | 分子 |
视频中出现的短语动词
| 单词 | 发音 | 释义 |
|---|---|---|
| break down 动词 | 壞了 /坏了, 出故障 | |
| make up 动词 | /ˌmeɪk ˈʌp/ | 組成 /组成 |
| pick up 动词 | 拾取, 撿 /捡 | |
| show up 动词 | 露面 |
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| 定语从句 who / which + 从句 — 补充说明人或事物 | hemoglobin, which is · walls, which are · hypomotility, which means |
| 被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的 | is also known · are lined · are associated |
需要注意的发音
说话人用了 6 次缩略和弱读形式，例如 don't, isn't, can't。请按听到的简短形式来说。
- “th” 音: thick /θɪk/, smoothly /ˈsmuːðli/, smooth /smuːð/, thrive /θɹajv/, smoothie /ˈsmuːði/
- “sh” 和 “zh” 音: infection /ɪnˈfɛkʃən/, sharp /ʃɑɹp/, concentration /ˌkɑn.sənˈtɹeɪ.ʃən/, medication /mɛdɪˈkeɪʃən/, nutrition /njuːˈtɹɪʃ.ən/
- 长单词——注意重音位置: cholesterol /kəˈlɛstəɹɒl/, ingredient /ɪnˈɡɹiːdi.ənt/, primarily /ˈpɹaɪ.mə.ɹə.li/, similarly /ˈsɪm.ə.lə.li/, concentration /ˌkɑn.sənˈtɹeɪ.ʃən/
如何用这段视频练习
- 先完整听一遍视频，不要开口，记下不认识的单词。
- 用正常速度逐句跟读，每句重复到你的节奏与说话人一致为止。
- 录下自己的声音并与原声对比，特别注意 boil, cholesterol, calcium 这类单词。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。