The best thing is to be watchful and see the family doctor for any change in your normal health.

最好的做法就是保持警惕，身体一有变化就去看家庭医生。

《柯林斯英汉双解大词典》

Be watchful of computer viruses.

警惕电脑病毒。

youdao

We'll have to be watchful, said Father Terry.

那么我们对他多观察着点儿好了，特里神甫说。

youdao

Wherever there is market power, the antitrust authorities have reason to be watchful.

ECONOMIST: Economics focus

Fed Chairman Bernanke will surmise in a speech that the economy is only pausing, and while the Fed will be watchful, action is not needed.

FORBES: Like Meatloaf, Fed Says, 'Let Me Sleep On It'

Forecasters say people should limit outdoor activity during the hottest portions of the day, wear lightweight clothing, drink plenty of water and be watchful for signs of heat exhaustion, which include heavy sweating, pale and clammy skin, weak pulse, fainting and vomiting.

CNN: Heat advisories issued to states dwindles to 15