on the watch for

基本解释

Be on the watch for this one .
一定要注意这一状态。
So for your Happiness Project, be on the watch for milestones.
所以在你的快乐计划中，请对这些里程碑要留心。
Meanwhile, we fill our days by reading romance novels and peering from behind closed curtains, on the watch for knights on big white stallions.
同时，我们在阅读言情小说，从幕布后凝视有骑士骑着白色骏马的剧集中度日。

Always keep the plants moist. Watch for yellowing or black spots on the stems.
So will we be using the internet for video on-demand, will that be the killer app? Will millions of people wide watch this video right when they want to watch it?
所以我们会使用互联网实现随需视频么，那会成为杀手级应用么？会有数百万人,就在他们想看的时候看到视频么？
麻省理工公开课 - 媒体、教育、市场课程节选
Bad weather has interfered with efforts to send out boats to clean up the oil and watch for the effects on wildlife in the Gulf of Mexico.

He says he's in talks with chains in Italy and France and is on the watch for U.S. retailers that come onto the market.
FORBES: Magazine Article