跟讀練習: 2-Minute Neuroscience: Leptin & Ghrelin - 通過影片學習英語口語
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16 句
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Leptin and ghrelin are two hormones that exert opposing influences in the regulation of appetite and energy balance.
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Leptin is produced mainly by fat cells, and circulating leptin levels increase as body fat increases, reflecting the amount of stored energy in the body.
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Leptin acts on receptors in several brain regions,
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most notably the hypothalamus, where it suppresses food intake by inhibiting appetite -stimulating neurons and activating neurons that reduce feeding behavior.
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Ghrelin is produced mainly by the stomach, and is released when energy availability is low, such as during a period of fasting.
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Ghrelin levels typically rise before meals and fall after eating, and thus may play an important role as a short -term driver of hunger and feeding.
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Ghrelin also exerts many of its effects through receptors in the hypothalamus, where it activates neurons that promote feeding behavior.
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Ghrelin may also influence the reward system, which could increase food intake for the sake of pleasure, independent of energy availability.
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In general, leptin inhibits hunger and ghrelin stimulates it,
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and the balance between the two forms part of a broader system that helps regulate feeding behavior and body weight.
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When we lose weight, for example, ghrelin levels tend to increase and leptin decreases,
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mechanisms that are thought to help us maintain a consistent weight over time.
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The role of leptin and ghrelin in obesity, however, is still unclear.
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Leptin levels in obesity are higher than normal, but the brain is often less responsive to leptin, a phenomenon called leptin resistance.
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Ghrelin levels are typically lower in people with obesity, and do not fall as significantly after a meal, nor rise as much before a meal.
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It's possible these more stable ghrelin levels could result in less restricted eating periods and contribute to obesity, but more research is needed to confirm this.
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本課的詞彙與口語要點
這節口語課以影片“2-Minute Neuroscience: Leptin & Ghrelin”為素材。 影片中反覆出現的詞有：ghrelin, leptin, levels, obesity, feeding。 這段影片共有 16 個句子、302 個單詞可供跟讀。 講話部分時長為 1:50。 說話人語速自然，每分鐘約 165 個詞，接近日常對話。 只有 71% 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 15 個值得學習的單詞，附發音和釋義：
| 單詞 | 發音 | 釋義 |
|---|---|---|
| obesity 名詞 | /ə(ʊ)ˈbiːsɪti/ | 肥胖, 肥胖症 |
| meal 名詞 | /ˈmiːl/ | 餐, 飯 /飯 |
| availability 名詞 | /əˌveɪ.ləˈbɪl.ɪ.ti/ | 可及性 |
| hunger 名詞 | /ˈhʌŋɡɚ/ | 飢餓 /飢餓 |
| intake 名詞 | /ˈɪnteɪk/ | 攝取量 /攝取量 |
| appetite 名詞 | /ˈæp.əˌtaɪt/ | 食慾 /食慾 |
| receptor 名詞 | /ɹɪˈsɛp.tə/ | 受體 /受體 |
| activate 動詞 | /ˈæktɪˌveɪt/ | 啟用 |
| stimulate 動詞 | /ˈstɪm.jəˌleɪt/ | 刺激 |
| consistent 形容詞 | /kənˈsɪs.tənt/ | 一貫的 /一貫的 |
| stable 名詞 | /ˈsteɪ.bəl/ | 馬廄, 馬棚 /馬棚 |
| stomach 名詞 | /ˈstʌmək/ | дўзы, 胃 |
| confirm 動詞 | /kənˈfɝm/ | 證實 /證實, 確認 /確認 |
| reflect 動詞 | /ɹɪˈflɛkt/ | 反映, 反射 |
| regulation 名詞 | /ˌɹɛɡjʊˈleɪʃən/ | 規則 /規則, 規例 /規例 |
影片中的語法
說話人最常用的結構，並附上影片中的原話：
| 結構 | 影片中的用法 |
|---|---|
| 被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的 | is produced · are thought · is needed |
需要注意的發音
- 長單詞——注意重音位置: obesity /ə(ʊ)ˈbiːsɪti/, availability /əˌveɪ.ləˈbɪl.ɪ.ti/, regulation /ˌɹɛɡjʊˈleɪʃən/, mechanism /ˈmɛk.ə.nɪ.zəm/, phenomenon /fəˈnɒm.ɪ.nən/
中文母語者容易讀錯的音：
- /v/ — 不要讀成 /w/，上齒輕觸下唇: availability /əˌveɪ.ləˈbɪl.ɪ.ti/, activate /ˈæktɪˌveɪt/, responsive /ɹɪˈspɑn.sɪv/
- 詞尾子音 — 要讀清楚，後面不要加母音: intake /ˈɪnteɪk/, appetite /ˈæp.əˌtaɪt/, activate /ˈæktɪˌveɪt/, stimulate /ˈstɪm.jəˌleɪt/, consistent /kənˈsɪs.tənt/
- /r/ 和 /l/ 的區別: reflect /ɹɪˈflɛkt/, regulation /ˌɹɛɡjʊˈleɪʃən/, regulate /ˈɹɛɡ.jə.leɪt/, ghrelin /ˈɡɹɛlɪn/
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 obesity, meal, availability 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。