Meaning of kāi xīn:
kāi xīn
开心
Verb
to feel happy; to rejoice; to have a great time; to make fun of sb
Jīntiān wǒ hěn kāixīn.
今天我很开心。
Today I am very happy.
Jīntiān wǒ gǎndào hěn kāixīn.
今天我感到很开心。
Today I feel very happy.
Tāmen zuówǎn qù kàn diànyǐng, fēicháng kāixīn.
他们昨晚去看电影，非常开心。
They went to watch a movie last night and had a great time.
Zuótiān dàjiā zài huì shàng dōu zài kāixīn tā.
昨天大家在会上都在开心他。
Yesterday, everyone was making fun of him during the meeting.
