動詞 concentrate on:

1. center upon
   同義詞：focus on, center on, revolve around, revolve about, center

1. It's too hot to concentrate on book.
   熱得不能集中心思看書。
2. Having failed my French exams, I decided to concentrate on science subjects.
   我因法語考試不及格而決心專攻理科。
3. I can't concentrate on my work when I'm tired.
   我累了就無法集中精力工作。