动词
中文翻译：Unknown
同义词：
['- bend', 'curve', 'straighten', 'stiffen', 'harden', 'firm', 'rigid', 'stiff']
例句：
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1. The old man unbent his back and sat down on the bench.
老人弯下腰，坐在长椅上。
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2. The child unbent his knee and ran to play with his friends.
孩子弯下膝盖，跑过去和他的朋友们玩。
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3. The tree unbent its branches and let the sun shine through.
树弯曲了它的树枝，让阳光照进来。