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。
We will be more careful with money if we know how hard it is to earn money.
如果我们知道赚钱不易，就不会乱花钱。
She doesn't care how hard it is.
她不在乎那有多么难。
How hard it is in some cases to be believed!
有些事是多么不容易叫人相信！
No matter how hard it was, he never gave up.
无论多么艰难，他决不放弃。
We all know how hard it can be to fall in love.
我们都知道谈恋爱并非易事。
No matter how hard it is I will always love you.
不管有多困难，我都会一直爱你！
No matter how hard it is, I will make it one day.
无论多难，总有一天我会成功的。
Keep trying no matter how hard it seems, it will get easier.
不论多么艰难，努力尝试，会让它变得容易。
We don’t know how hard it is to stop thinking until we try.
如果不去尝试，我们不会知道要停止胡思乱想有多难。
A promise is a promise - no matter how hard it is to keep.
誓言就是誓言，不管遵守起来有多难。
I knew how to put things together, and how hard it would be to do.
我知道怎样把事情整合起来，也知道这样做的艰辛。
No matter how hard it is , I will never give up learning English.
无论多么难，我永远不会放弃学习英语。
But the story of 1938 also shows how hard it is to apply these insights.
但是，1938年的故事同时也告诉我们，要采用这些见解是多么的困难。
Regardless, the investigation showed how hard it is to crack such a case.
不论如何，这次调查显示出了应对类似案件的棘手之处。
Consider how hard it will be to "recreate" the business process instance.
考虑“重建”业务流程实例的难度有多大。
I realize now for the first time how hard it is to define this bitterness.
第一次，我意识到要定义这种痛苦是如此之难。
Regardless of how hard it tried, it could not break the chain and run free.
不管它花多大的气力，都无法挣断铁链，获得自由。
The level of the team is incredible though, so I know how hard it will be.
这支球队的实力是人们难以想象的，所以我知道我所面临的难题十分艰巨。
You talk about the need for appropriate simplicity and how hard it is to achieve.
你谈到需要合适的简化和实现它的困难程度。
We all knew how hard it was and how patient you have to be, but we did it anyway.
我们都知道这是非常困难的，需要很多耐心，但是我们决定去做。
When you're about to say goodbye, think twice, look back, and remember how hard it was to say hello.
当你想说再见的时候，请三思，请回回头，想想当初遇见的时候是多么不容易。
Wise men appreciate everyone, for they see the good in each and know how hard it is to make anything good.
聪明之人欣赏每一个人，因为他们看到了每个人身上的优点，也懂得做好任何一件事情有多难。
Let's do an example. Let's try to figure out if we have just a uniform disk how hard it is to spin it around its center.
还是看个例子吧，有一张均匀的唱盘，让它绕中心旋转有多难呢？
Although the coral looks hard, it is very delicate.
虽然那珊瑚看起来坚硬，它其实非常易碎。
They worked so hard, it was not strange that they succeeded.
他们工作得那样努力，取得成功是不足为怪的。
They worked so hard, it was not strange that they succeeded.
他们工作得那样努力，取得成功是不足为怪的。
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