The tennis players need total concentration during play.
网球运动员在比赛中需要全神贯注.
The drug affects one's power(s) of concentration.
这种药影响人精神不能集中.
The inward flow of a fluid through a permeable membrane toward a fluid of greater concentration.
内渗透一种液体透过可渗透膜流向另一种浓度比它高的液体的内部流动
