名词
中文翻译：手肘上的疤痕
同义词：
['knuckle scar', 'knuckle mark']
例句：
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1. He had a knuckle scar on his left hand fromplaying sports.
他左手上有一块运动时留下的疤痕。
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2. The old man had aknuckle mark on his right handfrom years of manual labor.
这位老人右手上有一块多年手工劳动留下的疤痕。
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3. She noticedthe knuckle mark on herfriend's arm and wondered what happenedto him.
她注意到朋友手臂上的疤痕，想知道发生了什么事。