HSK 2 · adjective
快乐
happy; joyful
孩子们都很快乐。
Háizimen dōu hěn kuàilè.
The children are all very happy.
孩子们和大人都很快乐。
Háizimen hé dàrén dōu hěn kuàilè.
Both the children and the grown-ups are very happy.
他的日子过得很快乐。
Tā de rìzi guò de hěn kuàilè.
He leads a very happy life.
祝你生日快乐！
Zhù nǐ shēngrì kuàilè!
Happy birthday to you!