happy

英 [ˈhæpɪ]  美 [ˈhæpi]

adj. 高兴的；快乐的；幸福的；乐意的；愿意的

That's one of my happiest memories. 
那是我最快乐的回忆之一。
Money won't make you happy. 
金钱不会使人快乐。
By happy coincidence, Robert met Richard and Julia and discovered they were experiencing similar problems.
很巧的是，罗伯特碰到了理查德和朱莉娅，发现他们都遇到了类似的问题。
The swings and seesaw should keep the kids happy after they finish building sandcastles. 
孩子们堆完沙堡之后，荡秋千、玩跷跷板应该会让他们开心的。