课堂上气氛很活跃。
The atmosphere in class is very lively.
active; lively; excited
Every character draws itself, stroke by stroke. Then grab the brush: trace it yourself and hear the word when you finish.
Nice writing!
Chinese words snap together like bricks. Every word below shares a character with this one, so you are already halfway to knowing it.
课堂上气氛很活跃。
The atmosphere in class is very lively.
你在这个小组活跃吗?
Are you active in this group?