The policemen seem to be on the alert against something and their expressions alter when they see the clock--the crew thought it was a bomb and alerted the police!
警察好像随时准备着应付什么，看到是只闹钟时他们的表情改变了--原来机组人员把闹钟当成了，并且向警察报了警！
We are therefore campaigning for authors, researchers and editors to be on the alert for plagiarism and to work against cultural misunderstandings.
因此我们正在帮助论文作者、研究人员以及杂志编辑小心提防剽窃，而且还要对抗文化上的误解。
In the arctic, the seals that bask on the ice or swim in the water have to be continually on the alert against the Polar bear.
在北极区，海豹无论是在冰上晒太阳还是在水中游泳，都要时刻提防着北极熊。
In the arctic, the seals that bask on the ice or swim in the water have to be continually on the alert against the Polar bear.
在北极区，海豹无论是在冰上晒太阳还是在水中游泳，都要时刻提防着北极熊。
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