And the deeper the water, the smaller this motion.

而且水越深，这个运动就越小。

" Quiver" is not as common as " shiver" or " tremble" in conversational English, but it means basically the same thing – a small, quick motion with your body, a shaking of the body.

“Quiver” 在英语会话中不像“shiver” 或“tremble”那么常见，但它的意思基本上是一样的——你身体的一个小而快速的动作， 身体的颤抖。