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這是一篇關(guān)于維生素及其功能的文章。

carbon

hydrogen

oxygen


nitrogen

well-balanced
文中33s處有破折號(hào)


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.
維生素是有機(jī)化合物，飲食中必須含有?少量維生素以維持動(dòng)物(包括人)的生存和正常生長(zhǎng)。 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貥?gòu)成，一般是碳、氫、氧，有時(shí)還有氮。它們的不同之處在于每種維生素內(nèi)部的元素排列不同，并且每種維生素在人體內(nèi)都有一種或多種特殊作用。 雖然維生素對(duì)人體并無(wú)什么營(yíng)養(yǎng)上的用處，但吸收足夠的維生素是必要的。盡管如此，有些人出于保險(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)維生素的需求。