主系表~从简单句到复合句
1.Vitamins are organic compounds.
2.Vitamins are organic compounds necessary for normal growth of life.
3.Vitamins are organic compounds necessary for normal growth and maintenance of life of animals,including men.
4.Vitamins are organic compounds necessary in small amount in the diet for normal growth and maintenance of life of animals,including men.
核心就是第一句,之后2 3 4都是在后面加上形容词短语 都是修饰compounds
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