名词
中文翻译：金属门
同义词：
['steel gate', 'iron gate']
例句：
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1.The new security system uses a metal gate to keep people out.
新的安全系统使用金属门来阻止人们进入。
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2. The old mansion had a metal gate that could be opened with a key.
这座老宅有一个可以用钥匙打开的金属大门。
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3. The construction workers were using a metal gate to secure the area.
建筑工人正在使用一个金属大门来加固这个区域。