英语翻译原文：维持生命必须的食物有三类.一是碳水化合物.碳水化合物广泛存在于动、植物,包括糖、淀粉及纤维分子（cellu

ther are three kinds of food to maitain lfe.first is carbohydrate,which synthesis the nessissary
glucose and enzymes of biological process is widely in annimals and plants,it contains sugar,starch and cellulose .all of them can provide energy for people.the second is fat,which is more condenser food energy than carbohydrate ,butit only can be used as saving energy than using energy.the third is protain,which is composed of macromolecules like hydrogen,oxygen and nitrogen.it is not to provide energy ,but the necessary material to build a life.
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Maintain life must have three kinds of food. One is the carbohydrates. Carbohydrates exist widely in plant and animal, include sugar, starch and fiber cellulose, provide the energy for human beings. C...

The most necessary food that maintain people's life includes three kinds.The first one kind of it is carbohydrates.Carbohydrates largely exist in animals and plants ,it incldes surger starch and cellu...

There are three kinds of foods to maintain fundamental necessity for life. The first kind is carbohydrate, which, including sugar, amylum and cellulose, exsits in organisms as of animals and plants an...