摘要:① 指人.事物的类别. A computer is a machine. 电脑是一种机器. A boy is waiting for you. 一个男孩在等你. ② 表示one 或every. I have a mouth, a nose and two eyes. 我有一张嘴巴.一个鼻子和两只眼睛. ③ 用于某些固定短语中. A lot of 许多. a few 一些, a number of 许多
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