名词
中文翻译：看门狗
同义词：
['guard dog', 'watchdog例句：1. The policeman was watching his watch dog for any suspicious activity.（警察在监视他的看门狗，以防任何可疑活动。）']
例句：
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1. The policeman was watching his watch dog for any suspicious activity.
警察在监视他的看门狗，以防任何可疑活动。
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2. The old man had a watch dog that he trained to protect his home.
这位老人有一只训练有素的看门狗，用来保护他的家。
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3. The dog was a watch dog for the local police department.
这只狗是当地警察局的看门狗。