Our next obstacle was a shallow pool of water about half a mile across.

下一个障碍是一片约半英里宽的浅水塘。

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But a shallow gene pool can be a weakness, too.

但是，一个浅薄的基因库也可能是一个弱点。

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This pool had accumulated too thick, shallow water.

此池曾因积污太厚，池水日浅。

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This pool had accumulated too thick, shallow water.

此池曾因积污太厚，池水日浅。

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