弯下腰摸摸地面。
When water flows around a river bend, it deposits sediment on one bank while cutting away at the ground on the opposite bank.
河在静静流淌,水会在河岸这边留下沉积物,并侵蚀另一边。
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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