1.我長了不少見識。
I've learned something.
The TV show was interesting. (那個電視節目很有意思。)
Yeah, and I've learned something. (是呀，我長了不少見識。)
I've learned something new. (我學到了一些新東西。)

2.那會引起火災呀!
It's a fire hazard. *hazard表示“人力無法躲避的危險”。
Look at John's toy! (快看約翰的玩具。)
It's a fire hazard. (那會引起火災呀!)
It could catch on fire easily. (這很容易著火。)
It could cause a fire.

3.什么事都有可能發生。
Anything could happen.
There's no knowing what may happen.
You never know. (任何事情都是很難預料的。)
Anything's possible.
It could happen to you. (對你來說什么都有可能發生。)