跟讀練習: Vitamin D Testing Challenges - 通過影片學習英語口語

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so in this video i want to touch on vitamin d testing challenges okay the big the big problem with vitamin d is that there's no agreed upon value of what you should have in your

blood i mean they have an idea or estimation and we can range all the way from this value right here to this value right here depending on what units you use could range from this value to this

value i guess you can take an average of these numbers depending on what units you're measuring vitamin d from also the institute of medicine will tell you that you need between 600 to 800 IUS

of vitamin d every day yet the endocrinology society will say you need a thousand to 200 IUS every day so again there's this there's not a lot of agreement on how much you need

or how much should be in your blood a couple things i want to talk about that are very very important though there's two forms of vitamin d one is an inactive form 25 hydroxy vitamin d so it's like the precursor to the active

form which is 125 dihydroxy vitamin d so this is the active form this is the inactive form the way this works and by the way most of the vitamin d in your blood is

the pre-inactive version and many times what they're testing is they're testing 25 hydroxy vitamin d they're testing the

precursor or the inactive vitamin d okay put that to the side we'll come back to it so what happens is you have the pre-vitamin d that goes through the body and goes

through the liver and from the liver it then goes to the kidney the kidney is the primary site for conversion of the inactive to the active version of

vitamin d what if there is damage to the kidney you're going to lose your conversion capacity and how many people have damage to the kidney well what damage is a kidney

diabetes is a is a big thing but also insulin resistance what percentage of the population has insulin resistance i would say between

65 to 75 of the entire population that is going to alter the ability for the kidney to convert the inactive to the active

when you get your test back from the lab that says your 5-hydroxy vitamin d is within normal levels well what about the active form are you getting a 100 conversion by the kidney

is there any problem with the kidney that's one variable it's very common to have people with a defect in the vitamin d receptors called polymorphism

and even though you may have normal vitamin d in your blood it's not being activated because at the receptor level it's not working

also if there's not enough bile in the body you won't get the conversion and if there's liver damage you won't be able to produce the bile to make the conversion

if there's no gallbladder there you could be bile deficient so you're not going to have enough bile to make the conversion we already mentioned about insulin resistance if there's inflammation in the body that can lower your ability to convert vitamin d

if there's malabsorption gut problems let's say you had a series of antibiotics as a child and that created scarring of your in your colon that can create a decreased capacity for conversion if

you had a gastric bypass that could also alter your ability to convert vitamin d so as you can see there are many different variables so you have to look at the big picture what i tell people is to err on the side

of taking more vitamin d than less and make sure you have enough bile so you can actually get the absorption all right i hope i didn't add more confusion but i wanted to clear

up some of these variables and the point of this video was just to mention that just because this right here is normal doesn't necessarily mean it's being fully converted

to the active form hey we're back with another amazing recipe no grains no sugar totally keto there's no

suffering in keto absolutely not karen and it's an immune system builder absolutely you have to check this out i think you should hurry up watch the recipe and make it yourself it's just so easy

to be keto but is it simple it's super simple we hope you enjoy making it as much as we are enjoying eating it

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本課的詞彙與口語要點

這節 B2 級別的口語課以影片“Vitamin D Testing Challenges”為素材。影片中反覆出現的詞有：vitamin, kidney, conversion, inactive, active。這段影片共有 24 個句子、759 個單詞可供跟讀。講話部分時長為 4:58。說話人語速自然，每分鐘約 153 個詞，接近日常對話。只有 81% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。

影片中的重點詞彙

影片中最難的 15 個單詞，附發音和釋義：

單詞	發音	釋義
vitamin 名詞	/ˈvɪt.ə.mɪn/	維生素 /維生素, 維他命 /維他命
kidney 名詞	/ˈkɪdni/	腎臟 /腎臟, 腎 /腎
boil 動詞	/bɔɪ(ə)l/	煮沸, 煮
insulin 名詞	/ˈɪnsəlɪn/	胰島素 /胰島素
precursor 名詞	/pɹɪˈkɜː.sə/	先驅 /先驅
receptor 名詞	/ɹɪˈsɛp.tə/	受體 /受體
altar 名詞	/ˈɔl.tɚ/	祭壇 /祭壇, 聖壇 /聖壇
depend 動詞	/dɪˈpɛnd/	信任, 信賴 /信賴
endocrinology 名詞	/ˌɛn.də.kɹɪˈnɑ.lə.d͡ʒi/	內分泌學 /內分泌學, 內分泌科 /內分泌科
gastric 形容詞	/ˈɡæstɹɪk/	胃的
malabsorption 名詞		吸收不良
polymorphism 名詞	/pɑliˈmɔɹfɪz(ə)m/	多型性
antibiotic 名詞	/ˌæn.taɪ.baɪˈɑ.tɪk/	抗生素, 抗菌素
colon 名詞	/ˈkoʊ.lən/	冒號 /冒號
absorption 名詞	/æbˈsɔɹp.ʃn̩/	吸收

影片中出現的短語動詞

單詞	釋義
go through 動詞	通過 /通過

需要注意的發音

說話人用了 12 次縮略和弱讀形式，例如 they're, you're, won't。請按聽到的簡短形式來說。

“sh” 和 “zh” 音: deficient /dɪˈfɪʃənt/, estimation /ˌɛs.təˈmeɪ.ʃən/, absorption /æbˈsɔɹp.ʃn̩/, inflammation /ɪnfləˈmeɪ̯ʃən/, confusion /kənˈfjuːʒən/
長單詞——注意重音位置: endocrinology /ˌɛn.də.kɹɪˈnɑ.lə.d͡ʒi/, estimation /ˌɛs.təˈmeɪ.ʃən/, polymorphism /pɑliˈmɔɹfɪz(ə)m/, antibiotic /ˌæn.taɪ.baɪˈɑ.tɪk/, inflammation /ɪnfləˈmeɪ̯ʃən/

中文母語者容易讀錯的音：

/v/ — 不要讀成 /w/，上齒輕觸下唇: vitamin /ˈvɪt.ə.mɪn/, inactive /ɪnˈæktɪv/, convert /kənˈvɝt/, variable [ˈvæɹ.i.ə.bl̩], activate /ˈæktɪˌveɪt/
詞尾子音 — 要讀清楚，後面不要加母音: inactive /ɪnˈæktɪv/, convert /kənˈvɝt/, depend /dɪˈpɛnd/, deficient /dɪˈfɪʃənt/, gastric /ˈɡæstɹɪk/
/r/ 和 /l/ 的區別: variable [ˈvæɹ.i.ə.bl̩], endocrinology /ˌɛn.də.kɹɪˈnɑ.lə.d͡ʒi/, polymorphism /pɑliˈmɔɹfɪz(ə)m/, builder /ˈbɪl.dəɹ/

如何用這段影片練習

先完整聽一遍影片，不要開口，記下不認識的單詞。
先用 0.75 倍速逐句跟讀，熟練之後再回到正常速度。
錄下自己的聲音並與原聲對比，特別注意 vitamin, kidney, boil 這類單詞。

什麼是跟讀法？

跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。

影子跟讀法: 閱讀完整分步指南 →

跟讀練習: Vitamin D Testing Challenges - 通過影片學習英語口語

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