河水在平坦的河床上减慢了流速.The river slows on the flat bottom.缓慢的流速足以防止还原剂的散失.A low rate is enough to prevent flushing of reductants.进口的流速不等于河水流速.The velocity in the intake is not equal to the stream velocity....
齿轮互相啮合.The teeth of the wheel gear into each other.这个大齿轮带动小齿轮使滚筒旋转.This large gear turns the small one to rotate the cylinder.天气冷时齿轮润滑油可能凝结而形成凹槽.Gear lubricants may congeal and channel in cold weather....
医生准许我重新开始训练。I was given the all clear by the doctor to resume playing.应该准许他偶尔也轻松一下。He should be allowed the occasional treat.车辆准许进入，但是车位有限。Cars allowed, but parking is limited....
The bottom line, he said, is that altruism may rely on a basic understanding that others hae motiations and actions that may be similar to our own.他说, 底线是利他主义可能是基于这样的基本认识:别人也有和我们自己近似的动机和行为.The scrapie agent in sheep may ...