on the watch的用法和样例：
例句
- The nurse watched to see what would happen.
护士注意着会发生什么情况。 - His eyes were back on the faint pulsing movement in the chest.
他再度注意着胸部轻微的起伏动作。 - Cowboys should be on guard against the attacks from wild animals.
牛仔必须提防着野兽的袭击。 - Wayne is constantly up to something and Wes and Rio you have to watch out for as well.
韦恩经常想捉弄别人，里奥和维斯你也得提防着点。
词汇搭配
- be on the watch (对 ... )留神...
- on the watch for 密切注意着
