名词
中文翻译：膝部支撑物
同义词：
['knee support', 'knee pad']
例句：
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1.The patient was lying on the hospital bed with his knees bent.
病人躺在床上，膝盖弯曲着。
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2.She sat on the couch with her knees pulled up to her chest.
她坐在沙发上，膝盖抵在胸口。
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3.He put his hands behind his head and leaned back against the wall, using a knee stand to support himself.
他双手撑头靠在墙上，用膝盖支撑来保持平衡。