It's a little bit more healthy, I think, than in a swimming pool.

这里会比在游泳池里更健康一点。

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So in the ocean, it's a lot bigger than a swimming pool.

而海洋里可比游泳池要大多了。

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Because a swimming pool has a lot of chemicals in it.

因为游泳池里添加了很多化学成分。

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