四分之一决赛

It is a good idea to familiarise yourself with them, andonly use those with which you are completelycomfortable.

词，而且只是在最合适的时候才使用它。说明：所列50词的例句，请去中英文句库里参考

Ame to ask me if I want to join them.

健美操队的教练来问我是否想加入。