happiness是不可数名词，不是可数名词。happiness作为抽象名词，属于不可数名词，因为它并非实物，不能分为个体的物体，因此该单词只有单数形式，没有复数形式，通常不能直接在前面用不定冠词a/an修饰，除非其后搭配了其他名词短语，中文含义为“幸福”、“愉快”、“幸运”。

happiness作为抽象名词，属于不可数名词，因为它并非实物，不能分为个体的物体，因此该单词只有单数形式，没有复数形式，通常不能直接在前面用不定冠词a/an修饰，除非其后搭配了其他名词短语，意为“幸福”、“愉快”、“幸运”。

例句：She found happiness in her later years.

她在晚年才寻得幸福。

He didn't want to cast a shadow on their happiness.

他不想给他们的幸福蒙上阴影。

A person's wealth is often in inverse proportion to their happiness.

一个人的财富常常与他的幸福成反比。

The equation of wealth with happiness can be dangerous.

把财富与幸福等同起来可能是危险的。

Giving up his job was a small price to pay for his children's happiness.

放弃工作是他为子女幸福所付出的小小代价。

The book describes a spiritual journey from despair to happiness.

这本书描述了从绝望到高兴的心理变化过程。

Career success is no guarantee of happiness.

事业成功并不是幸福的保证。

What's your definition of happiness?

你对幸福的定义是什么？

Wealth is not necessarily synonymous with happiness.

财富未必等同于幸福。

Her mood alternated between happiness and despair.

她一会儿高兴一会儿绝望。

The secret to happiness is to keep setting yourself new challenges.

幸福的秘诀就是要不停地给自己设定新的挑战。

Has it, in its 30 years, added much to the sum of human happiness?

30年来，它为人类带来了更多幸福吗？

She has since gone on to find happiness by fostering more than 100 children.

从那以后她代养了100多个孩子，并从中得到快乐。

When he went, our happiness and our security flew out of the window.

他走后，我们幸福安稳的好日子便到头了。