Because it's hard
难───hard;它───it
I found it hard to go up the slope.───我觉得上坡吃力.
Hard work is the best antidote to mischief.───繁忙的工作是防止为非作歹的最好方法.
He not only studies hard but also works well.───他不仅学习努力,而且认真工作.
You'll have to train hard before the next match.───在下一场比赛之前你必须好好锻炼.
The belief that one should work hard is ingrained in our culture.───人人都应该努力工作这个信念在我们的文化中根深蒂固.
If you don't work hard, you'll end up nowhere.───如不努力工作, 你就一事无成.
This job entails a lot of hard work.───这项工作需要十分努力.
Is it hard to bear with criticism?───忍受批评困难 吗 ?
It is hard to please all parties.
Poverty and love are hard to hide.
Hard work never did anyone any harm.
These people are accustomed to hard work.
Fortune is easily found, but hard to be kept.