With delicate children, cold meal is apt to lie heavy on the stomach.

体弱的儿童吃冷饭冷菜更容易滞胃。

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But full-grown elephants are so heavy they often prefer not to bend their knees to lie down on the ground and so they sleep standing up.

但是，完全成熟的大象非常重，它们常常不愿弯曲膝盖，躺到地上去，所以，它们站着睡觉。

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