I know that he has tried hard; be that as it may, his work is just not good enough.

我知道他已经尽力了，尽管如此，他的工作仍不太理想。

《牛津词典》

But the truth is there's not enough hard evidence that any of these things really work.

但事实真相是并没有足够的确凿证据能证明这些东西真的有用。

youdao

In midfield the quartet did not work hard enough to escape the clutches of Sir Alex's set-up.

中场四将也没有足够努力去摆脱弗格森设置的天罗地网。

youdao

They're efficient enough that you have to work hard to find opportunities, but not perfectly.

如果你付出足够的努力,还是能发现机会,所以市场并不完全有效

耶鲁公开课 - 金融市场课程节选

And their problem is not that they're not working hard enough, or they don't want to work, or they're being taxed too little, or they just want to loaf around and gather government checks.

WHITEHOUSE: The White House