kāi xīn
大伙儿在一起,说说笑笑,十分开心。
Dàhuǒr zài yìqǐ, shuōshuō xiàoxiào, shífēn kāixīn.
Everyone together, chatting and laughing, very happy.
别拿他开心。
Bié ná tā kāixīn.
Don't make fun of him.