knowledge是知识的意思，而acknowledge则是承认的意思，区别可以从以下例子看出：
Knowledge is the something you gained after study, and acknowledge is the response to something or attitude.
知识是你学习后获得的东西，承认是对某些东西的反应或者态度。
水利万物而不争,
而万物莫能与之争。
