To understand a life, one must first understand the age in which it was lived.

我们必须将土壤健康视为粮食安全的基础。

The poor dream all their lives of getting enough to eat and looking like the rich. And what do the rich dream of? Losing weight and looking like the poor.

海底并非永恒不变，而是在不断更新。

The arithmetic of modular forms is a key to understanding the deeper mysteries of number theory.

利润绝不能以环境为代价——尤其是在水产养殖领域。