重点短语
对……有害________________________________________________
在……顶部或顶端__________________________________________
take part in_____________________________________________
关掉______________________________________________________
付费；付出代价____________________________________________
采取行动__________________________________________________
play a part in___________________________________________
打扫干净__________________________________________________
减少；削减________________________________________________
instead of______________________________________________
对……有好处_____________________________________________
lead to_________________________________________________
砍掉；切掉_______________________________________________
such as_________________________________________________
到目前为止_______________________________________________