你们要集中精力学习。(be focused on)

男性，16岁，半年来逐渐出现失眠，上课时精力不集中，学习成绩明显下 降。不在意老师的批评。某日突然

集中精力看书学习的过程是有意注意运用的过程。（)

For a distributor to be successful, the exporter mustA．focus on one particular region.B．fi

Our research has focused on a drug which is so ______ as to be able to change brain chemis

翻译He focused his mind on his lesson.A. 他按时做功课。B. 他把心思集中在功课上。C. 他一

Your mind should be______on work and study.A．guidedB．aimedC．directedD．focused