The past is a shadow that clings to our heels.

You just once young but may be immature indefinitely.

The interplay between syntax and semantics is central to the study of formal languages.

每个数学问题都有一个解决方案；有时只是需要时间去找到它。

风、海和移动的潮汐就是它们本来的样子。如果其中有奇迹、美丽和庄严，科学将会发现这些品质。