352　hundred，thousand和million

① 这些数量词前有数词（one，two，three…）修饰时，表示确切数量，仍使用单数形式hundred，thousand，million…，再接复数名词。

The town has fifty thousands people.

The town has fifty thousand people.

这个小城有5万人口。

② 这些数量词前无数词，表示概数时，要用复数形式，后再加of。结构为：

Hundreds of people came to the meeting. 数百人出席了会议。

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①表示概数的hundreds of…，thousands of…短语中的of 之后，不可加the，these，those或所有格（my，your…）。

Thousands of the/those people gathered there.

Thousands of people gathered there.

数千人聚集在那里。

②表示确指的ten thousand，five hundred后，可加of，再加the，these，those或所有格（my，your…），用以表示某范围内的一部分。

这些/她的学生中有500个通过了考试。

Five hundred of students passed the exam.

Five hundred of the/her students passed the exam.

She has three hundred books. 她有300本书。（确指）

She has hundreds of books. 她有好几百本书。（泛指）

Four million of pencils were sold out.

Million of pencils were sold out.

Four million pencils were sold out.

400万支铅笔销售一空。

Millions of pencils were sold out.

数百万支铅笔销售一空。