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；接近地；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Α?/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(guó)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(zhǎng)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(duì)父母來說，孩子叛逆是個(gè)很棘手的問題。