名词
中文翻译：Unknown
同义词：
['elbow support', 'knuckle pad', 'elbow pad']
例句：
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1. The chair is designed to provide a comfortable knuckle support for the user's back.
椅子设计成为用户提供舒适的肘部支撑。
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2. She used an elbow pad to protect her arm during the game.
她在比赛中用肘部护垫来保护她的手臂。
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3. He put on his elbow pads before starting the race.
比赛开始前，他穿上了肘部护垫。