it's that momentum that's carried by the boat.

这就是使船运动的动量
A better way to say this is, you and the boat exchange momenta,

一种更好的解释方法是你和船交换了动量
you push the boat to the right, you move to the left,

你给船一个向右的力你向左运动
and your momentum is killed by the shore.

你的动量受到大地的作用减为 0
The boat, no reason to change, and keeps going.

而船的动量不会改变继续运动
So, can you calculate how fast the boat is moving?

所以你们能计算出船运动的速度吗
Can anybody tell me how to calculate how fast the boat is moving?

谁能告诉我如何计算船运动的速度
Yes?

你来说
But I'm on the shore now.

但我现在在岸上
I've fallen on the shore. I'm asking how fast the boat is moving.

我撞到了岸我问的是船运动的速度
Right, I think he's got the right answer.

好的我想他得到了正确答案
If I only told you that I jumped and landed on the shore,

如果只知道我起跳并落到岸上