A racking headache made him unable to concentrate on his study.

折磨人的头痛使他不能全神贯注地学习。

youdao

Jerusha was unable to concentrate on what Mrs. Lippett said after this. In her heart she was both touched and extremely happy.

接下来李派特太太又说了些什么，洁茹实在无法再专心听下去了。

youdao

I was unable to concentrate on studying and for a time, I was even going to just pack my bags and leave for home instead of sitting those exams.

我无法专心学习，有段时间，我甚至想收拾行李回家去，而不是坐在这里考试。

youdao

The lack of food before school - or only snacking on unhealthy food - means that pupils arrive unable to concentrate and more likely to behave badly, say teachers in the survey.

BBC: Parents 'failing to give children breakfast'