watch out 后面接什么介词

For

watch out 密切注视,当心, 提防

watch out for 戒备, 提防, 密切注意

for

例句与用法:
1. I advised them to watch out for slick spots on the sidewalk.
我叫他们当心人行道上路滑的地方。

2. In the rush to go folkloric watch out for collision of cultures.
在民俗化的热潮中，要提防不同文化的冲突。