Keep a close watch on the enemy's movements.

密切注意敌人动向。

《新英汉大辞典》

Keep the bedroom for sleeping only. It's a bad habit for you to use your bedroom as a place to eat, watch TV, read, talk on the phone, or discuss important matters with your family members.

卧室只用于睡觉。如果你在卧室吃饭、看电视、读书、打电话或与家人讨论重要事情的地方，这是一个坏习惯。

youdao

Some use them to keep a close watch on the demand for their line of work or gather information on compensation to arm themselves when negotiating for a raise.

有些人用它来密切关注自己所在行业的需求情况，或者收集有关薪酬的信息，以便在加薪谈判时为自己做好准备。

youdao

Well,I think it's that governments around the Gulf do actually keep a very close watch on their populations and on people coming in and out of their countries.

VOA: standard.2010.08.11

The government said that it would continue to keep a watch on the currency's movements and "respond as appropriate".

BBC: Japanese government approves $116bn stimulus package

The rest are in the 10% to 13% range, so keep a watch on them, since they may become buys long before the next issue of Income Securities Investor.

FORBES: Magazine Article

It is right for the government to keep a watch on colleges and universities to ensure that they are not being used as conduits for workers pretending to be students.

ECONOMIST: British universities