45[si shi wu]是44与46之间的自然数。同时45也是奇数，不是质数，45也是一个单数。

45用英文怎么写？

Forty-five

英 [ˈfɔːti faɪv]  美 [ˈfɔːrti faɪv] 

Forty-five的双语例句

1.I missed the appointment because I was forty-five minutes late. 

就因为我迟了四十五分钟，我连面试都错过了。

2.I am eighteen and my father is forty-five, but we have no generation gap in our family. 

我十八岁，而父亲四十五岁，可是在我们家没有代沟。

3.Where's my husband? I was expecting him here at five forty-five. 

我丈夫怎麽还没来？我们约好了五点四十五在这会面的。

4.That alarm clock must be fast. It's five forty-five. 

那个闹钟一定是快了。现在是五点四十五。

5.Now there are three teachers and forty-five students in the primary school. 

这所小学现在有三名教师和四十五名学生。