动词短语
中文翻译：Unknown
同义词：
['watch closely', 'keep a close eye on', 'monitor closely']
例句：
-
1. The policekept close watch on the suspects during the investigation.
警方在调查期间密切监视嫌疑人。
-
2. She kept a close watch on her children's safety while they were away at school.
她密切监视孩子们的安全，直到他们去学校。
-
3. The doctors kept close watch on his health after the surgery.
医生们在他手术后密切监视他的健康情况。