动词
中文翻译：Unknown
同义词：
['tightening', 'tightening', 'constricting例句：1. The fabric isso stretchy that it can be easilypulled on and off.（这布料太有弹性了，可以轻松地穿脱。）']
例句：
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1.伸展；弯曲；使有弹性2.
在衣服上
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3.
在肌肉上
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1. The fabric isso stretchy that it can be easilypulled on and off.
这布料太有弹性了，可以轻松地穿脱。
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2. She flexed her muscles to prepare for the race.
她拉伸肌肉为比赛做准备。
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3. The tightrope walker had to flex his bodyto balance on the thin wire.
走钢丝的表演者必须身体紧绷才能在细绳上保持平衡。