In the pursuit of mathematical truth, we often find more questions than answers.
地质时间不仅漫长,而且其事件的发生是不规则的。
穷人一生都梦想着吃饱饭,看起来像富人。而富人梦想什么呢?减肥,看起来像穷人。
The more you dwell in the past, the less you prepare for the future.