It swam quickly, stopped suddenly and started swimming slowly again.
它游的很快，突然停下来并开始游的很慢。
The boat sailed quickly by the hole, and the rat swam after it.
这艘船快速地驶过那个洞穴，老鼠游过来追这艘船。
As soon as it noticed a human's shadow, it swam away quickly.
它发觉一个人的阴影时，就赶快逃泳了。
As soon as it noticed a human's shadow, it swam away quickly.
它发觉一个人的阴影时，就赶快逃泳了。
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