肖恩是个思维敏捷、行事随兴的人。Sean's a fast thinker, and he acts on impulse.巴纳比可能15岁了，但他动作敏捷，适合打羽毛球。Barnaby may be 15, but he's nippy and suited to badminton.从他的文笔可以看出他思维敏捷。Everything he writes demonstrates the acuteness of ...
Defense planners predict an extended period of retrenchment.国防规划人员预计开支紧缩期会延长。Retrenchment in the colleges could force thousands of students back into the unemployment lines.学院若缩减经费,数千名学生将被迫回到失业工人的行列.The company is in for...
如果冲量为零, 则动量不变.If the impulse is zero, there is no change in momentum.正周相动力冲量的定义可以用类似的式子表示.The positive phase dynamic impulse can be defined by a similar expression.用于碰撞过程的动量定理——冲量定理.The momentum theorem applied to an imp...