I'm not where I want to be, but I'm not where I used to be.

"In observational studies, we often have to rely on assumptions that are not directly testable."

企业的成功，不是偶然的，而是必然的。

In the realm of algorithms, efficiency and elegance are not mutually exclusive but are often two sides of the same coin.

汽车工业是一个国家综合实力的体现，没有强大的汽车工业，就没有强大的国家。