"It's the only thing," said the Water Rat solemnly, as he leant forward for his stroke.

“这是独一无二的事。”水鼠俯身划起桨来，一本正经地说。

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For one thing, they help control the rat and mouse population.

一方面，它们有助于控制老鼠的数量。

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For one thing, they help control the rat and mouse population.

一方面，它们有助于控制老鼠的数量。

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