1、To be on the watch for new trends or information.
敏銳，精明注意新動向或信息

2、Be on the watch for thieves in this crowd.
提防人群中有小偷。

3、The police warned people to be on the watch for intruders
警方預先通知大家防備有外人闖入.

4、The police warned holidaymakers to be on the watch for car thieves.
警方提醒度假者提防偷車賊。

5、You should be on the watch against any attempts to cheat you.
你應該防備任何欺騙你的企圖。

be on the watch翻譯