work hard和hard work的含義不同、詞性不同、形容的對象不同。work hard意思是努力學(xué)習(xí)、辛勤工作，這里的work是動詞，hard是副詞，用來形容人工作很努力。hard work意思是努力工作、繁重的工作，這里的work是名詞，hard是形容詞，用來形容工作比較困難、繁重。

She complained that he did not work hard.

她抱怨他工作不努力。

She is very tenacious and will work hard and long to achieve objectives

她是個鍥而不舍的人，為了達到目標愿意長期苦干。

The president will have to work hard to restore his credibility.

總統(tǒng)將不得不努力使公眾恢復(fù)對他的信任。

Everyone would have to work hard together to rebuild the economy

所有人都應(yīng)該一起努力以重建經(jīng)濟。

The Government will have to work hard to win back the confidence of the people

政府必須勤奮工作以重新贏得人民的信任。

Magicians do not dabble, they work hard.

魔術(shù)師可不是隨便玩兩下的，他們下了苦功鉆研。