keep watch and possible
保持警惕
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The official said the heads of all the FBI field offices have also been told to "keep in mind the significance of the news" about bin Laden and watch out for any possible activity in their regions.
CNN: U.S. anticipates al Qaeda 'threats of retaliation'
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