我们从不如我们看起来那样幸福。
We are never as happy or as unhappy as we imagine.
In the realm of algorithms, efficiency and elegance are not mutually exclusive but are often two sides of the same coin.
中心地的等级越高,其服务的区域越大,此类中心地的数量越少。
漂亮的脸孔是给别人看的,而有智慧的头脑才是给自己利用的。