on the watch for的用法和樣例：
例句
- I was walking around, keeping an eye out for him.
我四處走動，注意著他。 - The nurse watched to see what would happen.
護士注意著會發生什麼情況。 - Cowboys should be on guard against the attacks from wild animals.
牛仔必須提防著野獸的襲擊。 - Wayne is constantly up to something and Wes and Rio you have to watch out for as well.
韋恩經常想捉弄別人，里奧和維斯你也得提防著點。
