核心詞匯：

    organic adj. 器官的, 有機(jī)的, 組織的, 建制的
    [例] an organic part 一個(gè)有機(jī)的組成部分
    [派生] organism n. 生物體, 有機(jī)體

   compound n. 混合物, [化]化合物 adj. 復(fù)合的 v. 混合, 配合
   [例] If you take this action, it will only compound your problems. 如果你這么做，只能  徒然增加你的困難。
  [同義] complex, mixture；blend
  [派生] compounding n. 組合, 混合

 maintenance n.1 維護(hù), 保持 2 生活費(fèi)用；扶養(yǎng)
  [例] He took a course to learn about car maintenance. 他學(xué)習(xí)了汽車保養(yǎng)的課程。
  [反義] abandonment n. 放棄
  [派生] maintain vt.1 維持, 維修；繼續(xù) 2 供養(yǎng), 主張

  deficiency n. 缺乏, 不足
  [例] a nutritional deficiency 營(yíng)養(yǎng)缺乏
  [同義] shortage, insufficiency, lack, inadequacy，weakness
  [派生] deficient adj. 缺乏的, 不足的, 不完善的
  [固定搭配] make up for a deficiency 補(bǔ)足虧空

  apparent adj. 顯然的, 外觀上的
  [例] It was apparent that he knew nothing about how to repair cars.
  很明顯，他一點(diǎn)兒也不知道怎樣修理小汽車。
  [同義] clear, obvious, plain, seeming, evident
  [反義] hidden v. hide 的過(guò)去分詞 adj. 隱藏的
  [派生] apparently adv. 顯然地

  essential adj. 1 本質(zhì)的, 實(shí)質(zhì)的；基本的 2 提煉的, 精華的
  n. 1 本質(zhì), 實(shí)質(zhì)2 要素, 要點(diǎn)
  [例] What is the essential difference between these two economic systems? 這兩種經(jīng)濟(jì)體 制的本質(zhì)區(qū)別是什么?
  [同義] basic, fundamental, important, necessary, needed, required
  [派生] essentiality n. 本性, 真髓, 本質(zhì), 重要性

  excess n. 過(guò)度, 剩于, 無(wú)節(jié)制, 超過(guò), 超額 adj. 過(guò)度的, 額外的
  [例] You have to pay for excess luggage on a plane. 在飛機(jī)上你得付超重的行李費(fèi)。
  [同義] additional, extra, surplus
  [反義] deficiency n. 缺乏, 不足
  [派生] excessive adj. 過(guò)多的, 過(guò)分的, 額外
  [固定搭配] in excess of 超過(guò)

【真題原文】

  學(xué)習(xí)完單詞后自己認(rèn)真翻譯原文，并將原文中紅色字體部分句子的譯文回帖，認(rèn)真答題者獎(jiǎng)勵(lì)50HY，灌水者殺無(wú)赦。

  Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man.

  They do not provide energy, nor do they construct or build any part of the body. They are needed for transforming foods into energy and body maintenance. There are thirteen or more of them, and if any is missing a deficiency disease becomes apparent.

  Vitamins are similar because they are made of the same elements-usually carbon, hydrogen, oxygen, and sometimes nitrogen. They are different in that their elements are arranged differently, and each vitamin performs one or more specific functions in the body.

  Getting enough vitamins is essential to life, although the body has no nutritional use for excess vitamins. Many people, nevertheless, believe in being on the "safe side" and thus take extra vitamins. However, a well- balanced diet will usually meet all the body' s vitamin needs.

【原文翻譯】

    維生素是有機(jī)化合物，飲食中少量的維生素是維持動(dòng)物（包括人類）生存和生長(zhǎng)必不可少的部分。

    它們不提供能量，也不構(gòu)成身體的任何一部分，它們的任務(wù)是把食物轉(zhuǎn)變成能量和維持身體健康。至少有13 種維生素，若缺少其中一種，缺乏癥疾病便明顯可見(jiàn)。

    各種維生素都很相似，因?yàn)樗鼈冇赏瑯拥脑�素�?gòu)成，一般包括碳、氫、氧，有時(shí)還有氮。各種維生素的不同之處在于，各種維生素的元素排列不同，同時(shí)每種維生素在人體內(nèi)都有一種或多種特別的作用。

   吸取足夠的維生素對(duì)生命是必要的，但過(guò)量的維生素對(duì)人體并無(wú)滋養(yǎng)的用處。盡管如此，許多人出于保險(xiǎn)的想法，還是攝入過(guò)量的維生素。不過(guò)均衡的飲食一般能夠完全滿足身體對(duì)維生素的全部需求。