a dog kept to guard private property
看门狗。
a person or group whose occupation or function is to monitor the practices of companies providing a particular service or utility
监督人员,监察人员
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the consumer watchdog for transport in London .伦敦交通乘客监督员。
maintain surveillance over (a person, activity, or situation)
监督(人,活动,形势)
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how can we watchdog our investments? 我们怎样监督我们的投资呢?