名词
中文翻译：Unknown
同义词：
['1. back pain', 'lower back pain2. exhaustion', 'weariness']
例句：
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3.
在工作或运动中
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3. strain, fatigue例句：1. He had a back break from lifting the heavy box.
他从搬那个重箱子中背痛了。
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2.She was exhausted after her long day at work.
她工作了一整天后筋疲力尽。
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3.The marathon runner felt a strain in his back during the race.
马拉松跑者赛中感到背部有拉伤。