Most importantly, I will need to learn to swim!

最重要的是，我需要学会游泳！

How can you learn to swim without going to a pool?

你不去游泳池怎么学游泳？

Theoretically, everyone can learn to swim.

理论上，每个人都能学会游泳。

It is a good idea to learn to swim.

学游泳是个好主意。

Learn to swim by swimming.

在游泳中学习游泳。

Yes? Well,how can you learn to swim?

喜欢？那好，你是如何学游泳的？

Remember : you learn to swim by swimming .

记住：你是在游泳中学会游泳；

James: But you should learn to swim if you can.

詹姆斯：可是只要有机会，你就应该去学游泳。

Only by practicing swimming can you learn to swim.

只有通过学习游泳，你才能学会游泳。

When they learn to swim, most people are children.

意思是当他们学游泳的时候，很多人是小孩。