1.
Give x, it follows that ...
已知x， 则可推出…
2.
The heart knows its own bitterness.
[谚]心中的苦楚自已知道。
3.
only known venomous lizards.
已知仅有的有毒蜥蜴。
4.
Make the best of a bad bargain.
已知吃亏，尽力而为。
5.
It is taken as a given.
这事被认为是已知事实。
6.
The hydrogen is the known the lightest element.
氢是已知的最轻的元素。
7.
The more a man learns, the more he sees his ignorance.
知识越广博，越感已无知
8.
My information is that(ie I have been told that)they have all left.
据我所知,他们已经走了.
9.
The airport has advised of thick mist today
机场已通知今天有浓雾。
10.
For all I know he could have gone home already.
就我所知他已经回家了。
11.
Letter Three: Advising Having Effected Insurance
信三：通知已经办理保险
12.
The day has eyes, the night has ears.
若要人不知，除非已莫为
13.
You must by this time know my situation.
我的情形，想你已经知道。
14.
I ascertained that he was dead.
我得知他已经死了。
15.
We have had notice to quit.
我们已接到迁出通知书。
16.
acknowledge a letter
告知已收到一封信.
17.
I knew the river had risen.
知道河川已开始涨潮。
18.
She's alerted me for weekend duty.
她已通知我周末值班。