可以组成单词three,意思是:num.三。n.三岁三个人[东西]3字型。
例句: way I see it, you have three main problems.  
我认为你有三个主要问题。
2、There were only three of us on the advanced course.  
只有我们三人学高级课程。
3、There's room for three people in the back.  
后排有可容三人的空位。