例句：
Albert leaned back happily and lit a cigarette.
艾伯特開心地向后斜靠著并點燃一支香煙。
The children were playing happily with their toys.
孩子們正高興地玩著玩具。
She married the prince and they lived happily ever after.
她與王子成了婚，從此過著幸福的生活。
Money is not essential to happiness.
金錢對于幸福并非必不可少。
She found happiness in her later years.
她在晚年才尋得幸福。
'Happiness' is a derivative of 'happy'.
happiness是happy的派生詞。