Winkylux: 相似不一定合同啊

2301_80941057: 矩阵倍加前后，一样吗?

COLOLIN802: para12 英文版第二句开始错了，这段应该是 ⑫　The students and the professors have made a deal: neither of them has to throw himself heart and soul into what happens in the classroom. The students write their abstract, over-intellectualized essays; the professors grade the students for their capacity to be abstract and over-intellectual, and often genuinely smart. For their essays can be brilliant, in a chilly way; they can also be clipped off the Internet, and often are. Whatever the case, no one wants to invest too much in them—for life is elsewhere. The professor saves his energies for the profession, while the student saves his for friends, social life, volunteer work, making connections, and getting in position to clasp hands on the true grail, the first job.

2301_81056640: 太拗口了这篇文章

2301_79829641: 正交向量组可以有零向量