He knows how hard it was for her while he was gone.

他知道他不在的时候她有多难。

《柯林斯英汉双解大词典》

Everyone understood how hard it was to get back into the swing of things after such a long absence.

每个人都明白离开这么长一段时间后要重新全力投入有多难。

《柯林斯英汉双解大词典》

They tried again and again in the field, no matter how hard it was.

他们在田里一次又一次尝试，不管有多难。

youdao

Jack London's many stories truthfully explained just how hard it was to be a gold seeker in eighteen ninety-seven.

VOA: special.2009.02.11

What did you learn about how easy or hard it is to keep track of what food intake is?

你从记录食物摄入过程中,学到了什么,记录饮食是难是易

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And once you... when you're having that bad of a season, it's really hard to get everyone passionate about it,

所以一旦赛季取得很差的成绩，就很难保持球队的激情，

足球部队长的领导力 - SpeakingMax英语口语达人

Did you underestimate how hard it would be to change the way Washington works?

WHITEHOUSE: Presidential Press Conference

They had no idea how hard it would be, or how long it would take.

WHITEHOUSE: President Obama Awards the Medal of Honor to Specialist Leslie H. Sabo, Jr. | The White House

Nevertheless, Ellis knows how hard it will be for the Exiles to win in France.

BBC: Coach Dave Ellis passes on Brive secrets to Exiles