人生没有如果，只有后果和结果。

The collaboration between theory and experiment is essential for the advancement of physics.

We must not only succeed in the Chinese market, but also occupy a prominent position in the global dairy industry.

The key to managing complexity is to focus on the interfaces between components, not their implementations.

“柠檬问题”指的是当卖家比买家掌握更多信息时，评估产品质量的困难。