母子关系是矛盾的，在某种意义上，是悲剧性的。它需要母亲最强烈的爱，然而这种爱必须帮助孩子离开母亲，变得完全独立。
The mother-child relationship is paradoxical and, in a sense, tragic. It requires the most intense love on the mother's side, yet this very love must help the child grow away from the mother, and to become fully independent.
In computational complexity, we are not just dealing with the limits of what we can compute, but also with the limits of what we can prove.
谋杀一个幻影比谋杀现实要困难得多。
创新是将传统煤炭行业转变为现代高效行业的关键。
The more time I spent on mathematics, the more excited I got.