He is happy at home.

他在家很开心。

He is happy to see him.

他很高兴见到他。

He is happy about his son's growth.

他为儿子的成长感到高兴。

Liu Bin, a member of the camp, says that he is happy to help Mount Tai.

营地的一名成员刘斌说他很高兴帮助泰山。

When he is happy, he will whistle.

当他开心时，他会吹口哨。

His smile means he is happy.

他的微笑意味着他很高兴。

He is happy because he passed the exam.

他因为通过了考试而高兴。

He often hummel a melody when he is happy.

他高兴的时候经常哼唱一段旋律。

Though he is poor yet he is happy.

尽管他贫穷但是他很快乐。

Though alone, he is happy.

尽管单身，他却很快乐。