For example, they feel sleepy in classes and cannot concentrate attention on their study completely.
比如说，他们在课堂上会感到困，无法完全集中注意力在学习上。
If you don't concentrate your attention on work, you will achieve nothing.
如果你不把心思放在工作上，你终将一事无成。
I tried to concentrate my attention on my English studies.
我努力把我的注意力集中到我的英语研究上。
We must concentrate our attention on efficiency.
我们必须把注意力集中在效率上。
I can't concentrate my attention on it if I don't smoke.
我如果不吸烟，注意力就无法集中。
Never concentrate all your attention on one or two problems.
切勿把你的注意力只集中在一两个问题上。
They concentrate all their attention on video games, with their hands busy operating.
他们把所有的注意力都集中于游戏，手一直忙于操作游戏指令。
They concentrate all their attention on video games, with their hands busy operating.
他们把所有的注意力都集中于游戏，手一直忙于操作游戏指令。
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