work hard play hard的意思是努力工作努力玩。hard主要用作為形容詞、副詞、名詞，作形容詞時(shí)意為“努力的；硬的；困難的；辛苦的；確實(shí)的；嚴(yán)厲的；猛烈的；冷酷無情的”，作副詞時(shí)意為“努力地；困難地；辛苦地；接地；猛烈地；牢固地”，作名詞時(shí)意為人名。

例句：

Why do they have to work so hard?

他們?yōu)槭裁垂ぷ鞅仨毮敲磁�力�?/p>

Every one of us should work hard for the prosperity of our country.

我們每一個(gè)人都應(yīng)該為我們國家的繁榮而努力工作。

I find it hard to trust not only me, but everyone around me, Because of.

因?yàn)槟�，我發(fā)現(xiàn)很難再相信我自己以及周圍的每一個(gè)人。

The ground is as hard as stone after the long drought.

長期干旱之后，土地硬得就像石頭一樣。

It's very hard to maintain a relationship.

要維持一段關(guān)系，是很困難的。

It's very hard on parents when their children are rebellious.

對父母來說，孩子叛逆是個(gè)很棘手的問題。