1.几年级啊,自己说的自己明白吗
几年级啊,自己说的自己明白吗?滚犊子。
What grade are you in? Did you say that you figured out the meaning of everything? Go and take a hike, you little brat.
所谓初生牛犊不怕虎
As it is said in this adage, recently born cattle is never fearful of tigers.
牛犊子 little brat; little rookie; little inexpert person; little green hand
滚 go take a hike; go fly a kite; piss off