名词
中文翻译：保安
同义词：
['guardian', 'watchman', 'protector']
例句：
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1.The security guard was very helpful during the event.
在活动期间，保安非常有帮助。
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2. The policeman was called to the scene as a security guard.
警察被叫到现场作为保安。
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3.He is a security guard at the bank.
他在银行担任保安。