能源领域的创新不是可选的；它是可持续增长的必要条件。

"As a director, you have to be both a leader and a listener."

年轻人必须为履行生活所赋予他们的职责充实自己，同时要抵制生活的诱惑。

写作古文的难度，比登上青天还要难。

To truly understand the cosmos, we must first understand the smallest particles that make it up.

行为主义者放在自己面前的规则或衡量标准总是：我能否用"刺激和反应"来描述我所看到的这一行为？

When we can't talk about something, it becomes dangerous.

研究学习的唯一有意义的方法是通过客观测量。