释义：在人的一生中，应当做到无愧于古人。即要努力做到像古代的贤人一样，有高尚的品德和行为，不因个人的私欲而做出违背道德和原则的事情。

The desire to get rich is a natural human instinct, and it's not something to be ashamed of.

Abstraction is the key to managing complexity in software systems.

Diplomats should have the ability to respect and understand other countries and cultures, as well as the ability to communicate across language and cultural barriers.

实现明天理想的唯一限制是我们今天的疑虑。