They must have known what their father was up to.
他们一定已经知道他们的父亲在暗地里做什么。
I have known what it is like to go without food for days.
我已知道数日不吃东西是什么滋味了。
What an odd coincidence that he should have known your family.
他已认识你的家人，多么不寻常的巧合。
我已经知道这件事了。
Do not do that which you would not have known.
不要干你本来不知道的事。
Since 1914, scientists have known that birds flying in formation—a V-shape—expend less energy.
自1914年以来，科学家们已经知道，以V字形队形飞行的鸟类消耗的能量更少。
If the boy had destroyed any of his Horcruxes, he, Lord Voldemort, would have known, would have felt it?
如果那男孩销毁了他的某个魂器，他，伏地魔，肯定会知道，肯定会感觉到吧？
Many students at his university would have known his name, but they could all identify him by his signature.
他学校中的很多学生本来是知道他的名字的，但他们都只能从他的签名认出他。
For thousands of years, people have known that the best way to understand a concept is to explain it to someone else.
几千年来，人们都知道，理解一个概念的最好方法就是向别人解释它。
I count myself lucky to have known him.
和他相识，我觉得很幸运。
I have known cases where dogs have nipped babies.
我知道一些狗咬婴儿的事例。
We have known each other socially for a long time.
我们在社交场合相识有很长时间了。
He was a contemporary of Freud and may have known him.
他是弗洛伊德的同代人，可能认识弗洛伊德。
They are rivals who have known each other since boyhood.
他们是少年时代就相识的对手。
I mean to say, you should have known how he would react!
我的意思是说，你本应料到他会作何反应！
I didn't think our meeting was accidental—he must have known I would be there.
我认为我们相遇不是偶然的—他肯定知道我要去那里。
He bombarded Catherine with questions to which he should have known the answers.
他不停地追问凯瑟琳他本该知道答案的问题。
Maybe he should have known it.
也许他本应该知道这件事。
我认识他很久了！
I should have known the answer to his simple question.
我本应该知道他那个简单问题的答案的。
Without chemistry, we would never have known that we need soap to get the oil out of clothes.
如果没有化学，我们永远不会知道我们需要肥皂来去除衣服上的油污。
So far, I've completely got used to the life here and have known a lot about traditional Chinese culture.
到目前为止，我已经完全适应了这里的生活，也了解了很多中国传统文化。
我应该早点知道这些。
哦，我早该想到的。
他应该知道这件事的。
Please sort out what we have known.
请整理一下我们所知道的情况。
"Then again, how could they not have known?" Gary says.
“那么又来了，他们怎么会不知道?”加里说道。
The Mole would not have known that it was the same wood.
鼹鼠莫尔都认不出这是之前同一片树林。
We should have known that long-distance trains are often many hours late.
我们早应该知道长途火车经常会晚点好几个小时。
He seems to have known something about the modern economic theory of society long before modern economics was even developed.
他似乎早在现代经济学发展之前就对现代社会经济理论有所了解。
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