名词
中文翻译：门卫
同义词：
['guardian', 'sentinel', 'watchman']
例句：
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1.The gate guard was very helpful in guiding us through the crowd.
门卫在我们穿过人群时非常有帮助。
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2. The gate guard was on duty when we arrived.
我们到达时，门卫正在值班。
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3. The gate guard made sure that no one went through the restricted area without authorization.
门卫确保没有未经授权的人进入受限制的区域。