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2013-05-23 12:21
求翻译：Nowadays it is understood that a diet which contains nothing harmful may yet result in serious disease if certain important elements are missing. These elements are called 'vitamins'. Quite a number of such substances are known and they are given letters to identify them, A, B, C, D, and so on. Different diseases are a是什么意思？ 待解决
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Nowadays it is understood that a diet which contains nothing harmful may yet result in serious disease if certain important elements are missing. These elements are called 'vitamins'. Quite a number of such substances are known and they are given letters to identify them, A, B, C, D, and so on. Different diseases are a
问题补充： |
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