操办丧事，虽然礼仪繁多，但表达哀悼之情，才是最根本的。

The beauty of mathematics is that it allows us to abstract away from the physical world and focus on the underlying principles.

The difference between an adventure and an ordeal is attitude.

农业创新不仅仅是技术问题，更是关于理解土壤、气候和依赖它的人们。