听听他们的言论，看看他们的实际行为，考察他们的能力，谨慎的授予官职。

The interplay between topology and quantum mechanics is a rich field of study that continues to surprise us with its depth and complexity.

The best way to learn econometrics is by doing—working with real data and real problems.

"A book is a door. You open it. You step through."

心灵是一个不断变化的过程流。