What has a soft bed but never sleeps,a big mouth but never speaks? 为什么?

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What has a soft bed but never sleeps,a big mouth but never speaks? 为什么?
What has a soft bed but never sleeps,a big mouth but never speaks? 为什么?

What has a soft bed but never sleeps,a big mouth but never speaks? 为什么?
A river.
河床,河口.

A river