名词
中文翻译：锁门器
同义词：
['safety jack', 'locking jack']
例句：
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1. The lockout jack was used to secure the door.
锁门器被用来锁住门。
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2. The safety jack is essential for emergency situations.
安全锁对于紧急情况至关重要。
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3. The locking jack can be used to open heavy doors.
锁门机可以用来打开沉重的门。