We should keep a sharp look-out for their disruptive activities.
我们要严防他们的破坏活动。
One day the Captain said to Jim: "I want you to keep a sharp look-out for a seafaring man with one leg."
有天老船长对吉姆说：“你帮我仔细留意一个人。”他是个海贫，只有一条腿。
Take advantage of your bird's eye view of the city to keep a sharp look out for hungry customers.
利用您的鸟瞰城市，以保持大幅看看，为饥饿的顾客。
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