名词
中文翻译：夹紧
同义词：
['clamp', 'clamp down', 'secure', 'fasten']
例句：
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1. The car was held down by theheavy snow.
大雪使汽车无法行驶。
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2. He securedthe door with a lock to prevent itfrom being opened.
他用锁把门固定住以防止被打开。
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3. The workers were instructed tohold down the brakes until the emergencylights came on.
工人们被指示在紧急灯亮起之前抓紧刹车。