The number of new students decreased from 210 to 160 this year.

　　今年新生人數(shù)從210減少到160。

　　I could give you any number of reasons for not going.

　　我可以給你許多不去的理由。

　　In case you should need any help, here's my number.

　　萬一你需要幫助的話，這是我的電話號碼。

　　I have a number of things to do today.

　　我今天有許多事情要做。

　　Double the expected number of people came to the meeting.

　　出席會議的人數(shù)比預(yù)期的多一倍。