These hotspots are significant because they allow us to locate key areas for focusing efforts at conversation.雅思听力这句话,为什么是focusing efforts at conservation 而不是 on呢?
学生反复查看了柯林斯on的42条用法,朗文的49条用法,感觉没有一条释义可解释以下句子或结构中on的用法。 一,An honorary degree was conferred on him. 二 ,congratulate sb on sth 三,Troops advanced on the rebel stronghold.