...Know is know,no know is no know,is know 这句话有没有毛病?

...Know is know,no know is no know,is know 这句话有没有毛病?
...Know is know,no know is no know,is know 这句话有没有毛病?

...Know is know,no know is no know,is know 这句话有没有毛病?
知之为知之,不知为不知,是知也.
Know is know,no know is no know,is know also.
Real knowledge is to know the extent of one's ignorance.
Know is know,no know is no know,it is know,too.

知道就是知道，不知道就是不知道，这也是知道的一种表现

知之为知之,不知为不知，是知也.

http://dict.youdao.com/search?q=%E7%9F%A5%E4%B9%8B%E4%B8%BA%E7%9F%A5%E4%B9%8B&ue=utf8&keyfrom=dict.index
http://dict.youdao.com/search?q=lj%3A%E7%9F%A5%E4%B9%8B%E4%B8%BA%E7%9F%A5%E4%B9%8B&le=eng&keyfrom=dict.moresentence

语法有问题，应该是:
To know is to know. Not to know is not to know, and also is to know.
字面意思是：
知道是知道。不知道是不知道，也是知道。
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如果不能理解...

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语法有问题，应该是:
To know is to know. Not to know is not to know, and also is to know.
字面意思是：
知道是知道。不知道是不知道，也是知道。
==================================================================
如果不能理解，可以参考英文版《论语》里孔夫子的一句话的翻译，前面三分之二都是一模一样的。
"知之为知之，不知为不知。"
就被翻译成：
"To know is to know. Not to know is not to know."

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有问题，完全不符合语法，中国式英语
What you know, you know, what you don't know, you don't know. This is knowledge."
知之为知之,不知为不知,是知也。