So, even though the swimmer is moving from right to left, his hand is moving from top to bottom and the lift force adds to the thrust (see figure).

那么，即便游泳者是从右往左移动，他的手也是从上往下移动，所以浮力就叠加到前推力上(见图)。

youdao

So, even though the swimmer is moving from right to left, his hand is moving from top to bottom and the lift force adds to the thrust (see figure).

那么，即便游泳者是从右往左移动，他的手也是从上往下移动，所以浮力就叠加到前推力上(见图)。

youdao