He has obtained his wealth by hard work.

他靠辛勤劳动而致富。

《新英汉大辞典》

By hard work they made up the loss of time.

他们努力工作，补偿了失去的时间。

《新英汉大辞典》

However, she overcame it by hard work and perservance.Her success proves where there is a will, there is a way.

然而，她靠勤奋和毅力克服了这些不利因素。她的成功证明。有志者事竟成。

youdao

That is,this kind of pull-yourself-up-by-your-bootstraps, that with enough determination and hard work that you can transcend limitations of money or class or gender.

VOA: special.2010.03.08

The Green Revolution was the result of hard work by agricultural scientists who had green thumbs.

VOA: special.2010.05.23

By example,Arthur's father taught the importance of hard work.

VOA: special.2010.02.07

And yet she has, by hard work and guile and historic luck, multiplied the value of the business she inherited several hundred times over.

NEWYORKER: The Miner��s Daughter

We hold up the improbable and near-impossible achievements of the 1% as if they are doable just by hard work, a good attitude, and the right friends.

FORBES: Getting Over Our Over-Levered Selves

At the same time, politicians promoted the idea of individualism and meritocracy, the theory that one's station in life was best changed by hard work and dedication.

ECONOMIST: Unfairly, by its snobbish fellow citizens