If you do have an idea, you should firstly do your present job well and wait for the upcoming opportunity, rather than mess your present work and draw your future in your dream.
2
如果你再那么做,我就砸扁你的脑袋。
I'll bash your head in if you do that again.
《牛津词典》
3
这样做的目的是为了保护自己不被坠落的物体砸到。
The purpose is to protect yourself from falling objects.