名词
中文翻译：屈曲的腿
同义词：
['knees', 'knee flexion']
例句：
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1. He sat with his knees bent at the table.
他坐在桌子旁，膝盖弯曲着。
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2. The patient had to wear a knee brace for several weeks.
病人不得不戴几周的膝盖护具。
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3. During the race, athletes often experience knee flexion during the final stretch.
在比赛中，运动员在最后冲刺时常常出现膝盖内翻。