The number of new students decreased from 210 to 160 this year.
今年新生人数从210减少到160。
I could give you any number of reasons for not going.
我可以给你许多不去的理由。
In case you should need any help, here's my number.
万一你需要帮助的话，这是我的电话号码。
I have a number of things to do today.
我今天有许多事情要做。
Double the expected number of people came to the meeting.
出席会议的.人数比预期的多一倍。