轮船过河问题,可以把轮船的渡河运动分解为它同时参与的两个运动,一是轮船相对于水的运动(船的静水速度),一是随水流的运动(水冲船的运动,等 The problem of crossing a river can divide the movement of a river into two movements that it simultaneously participates in. One is the movement of the ship with respect to water (the speed of the still water of the ship), the other is the movement with water flow