他们可能认为海洋只是另一个可以靠游泳克服的障碍。

They may assume that the sea is just another such swimmable obstacle.

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而且，我们只有一个游泳池，还是在花园中间； 但是他们却有一整条溪流，没有尽头； 他们每天都可以尽情地玩水仗，我们家却只有我一个人游泳。

The son answered, “I saw that we have a dog at home, and they have four. We have a pool that reaches to the middle of the garden; they have a creek that has no end.

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他们可以从中度的或者剧烈的锻炼中得到这样的效果--你可以快步走，慢跑，跳舞，单车，或者游泳。

They can get it either with moderate or vigorous exercise -- you can enjoy a brisk walk, jog, dance, bike, or swim.

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