1.
Hence the saying: One may know how to conquer without Being able to do it.
故曰:胜可知,而不可为。
2.
for aught I know
也许，大概，也未可知，说不定，据我所知
3.
Really? I didn't know.
真的？我可不知道。
4.
Give x, it follows that ...
已知x， 则可推出…
5.
The people should be told to do this or that without telling them why
民可使由之,不可使知之
6.
perceptible by the senses especially the sense of touch.
可感知的、特别是通过触摸可以感知的。
7.
Thus we may know that there are five essentials for victory: (1) He will win who knows when to fight and when not to fight.
故知胜有五:知可以战与不可以战者胜,
8.
Hence the saying: If you know the enemy and know yourself, your victory will not stand in doubt; if you know Heaven and know Earth, you may make your victory complete.
故曰:知己知彼,胜乃不殆﹔知天知地,胜乃可全。
9.
If we know that the enemy is open to attack, and also know that our men are in a condition to attack, but are unaware that the nature of the ground makes fighting impracticable, we have still gone only halfway towards victory.
知敌之可击，知吾卒之可以击，而不知地形之不可以战，胜之半也。
10.
The tragedy is not in not knowing, But in not knowing that you don't know.
可悲的不在于无知，而在于不知道自己的无知。
11.
To be ignorant of one′ s ignorance is the malady of the ignorant.
不知道自己的无知正是无知者的可悲之处。
12.
Knowing the place and the time of the coming battle, we may concentrate from the greatest distances in order to fight.
故知战之地，知战之日，则可千里而会战；
13.
The focus was entirely on understanding the enemy and oneself.
可见焦聚全集中在知己知彼上面。
14.
Fear an ignorant man more a lion.---- Proverb.
无知的人比杀狮子还可怕。无知才无畏。
15.
Goodness knows who it can have been.
天知道那可能是谁。
16.
I'm licensed to tell you that.
我得到许可告知你此事。
17.
His ignorance is incurable.
他的无知是不可就药的。
18.
He knew that it was impossible.
他知道那是不可能的。