keep a watch on监视;观察;关注
keep night watch夜间巡逻
to keep night watch守夜
Keep close watch ashore密切注视
Keep p watch守望
keep a watch for密切注意
keep strict watch严密监视
Keep close watch on密切注视;亲密凝视;密切凝视;亲昵凝视
keep close watch严密监视