动词短语
中文翻译：在绳上拉紧
同义词：
['tie', 'tighten', 'constrict']
例句：
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1.The dog strained at the leash as it was led out for a walk.
狗在被带出去散步时，挣扎着勒紧了绳子。
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2.She strained at the door to see who was calling.
她用力拉开门，想看看是谁在敲门。
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3. The tension in the rope strained the muscles of the climber.
绳索的张力使攀岩者肌肉紧绷。