I keep thinking about this river somewhere, with the water moving really fast. And these two people in the water, trying to hold onto each other, holding on as hard as they can, but in the end it’s just too much. The current’s too strong. They’ve got to let go, drift apart.

在数学中，最深刻的思想往往源于最简单的观察。

Strengthen international cooperation to promote the improvement of technology and management in the coal industry.

游览过五岳之后，其他的山就没什么可看的了；而游览过黄山之后，连五岳也没什么可看的了

如果你不前进，你就在落后。