例句：
Albert leaned back happily and lit a cigarette.
艾伯特开心地向后斜靠着并点燃一支香烟。
The children were playing happily with their toys.
孩子们正高兴地玩着玩具。
She married the prince and they lived happily ever after.
她与王子成了婚，从此过着幸福的生活。
Money is not essential to happiness.
金钱对于幸福并非必不可少。
She found happiness in her later years.
她在晚年才寻得幸福。
'Happiness' is a derivative of 'happy'.
happiness是happy的派生词。