1.
Hold what you really know and tell what you do not know -this will lead to knowledge.
"知之为知之, 不知为不知, 是知也"
2.
Having half-baked knowledge is worse than knowing nothing at all.
一知半解，不如不知不解。
3.
If you know neither the enemy nor yourself, you will succumb in every battle.
不知彼不知己，每战必败。
4.
He who knows not the enemy and himself is bound to perish in all battles."
不知彼，不知己，每战必殆。
5.
He knows, doesn't he? -- No, he doesn't.
他知道吧? --不， 他不知道。
6.
He doesn't know, does he? -- Yes, he does.
他不知道吧? --不， 他知道。
7.
No. I only know that I love you.
不知道。我只知道我爱你。
8.
Do you understand anything they're saying?
你知不知道他们说什么？
9.
Knowing it's so, But don't know why it's so
知其然,不知其所以然
10.
If you know yourself But not the enemy,for every victory gained you will also suffer a defeat.
不知彼而知己,一胜一负﹔
11.
He who knows himself but not the enemy has only an even chance of winning.
不知彼而知己，一胜一负；
12.
No, everything is up in the air.
不知道，一切都是未知数。
13.
He who has no shame has no conscience.
不知羞耻的人没有良知。
14.
Confucius said: "Yu, shall I teach you about knowledge? What you know, you know, what you don't know, you don't know. This is knowledge."
子曰:「由、诲女知之乎。知之为知之,不知为不知,是知也。」
15.
Why Should We Say "the Ignorance and the Unknown" Are Not Beyond "the Knowing and the Known"-- One of the Clarifications of Knownology;
为什么说“不知与所不知”超不出“知与所知”——所知学释疑之一
16.
What time is it ? I have no idea.
几点了？我不知道。
17.
"What's the time?" "Search me!"
"几点了?""我不知道!"
18.
Well, I do not know really .
噢，我真的不知道。