历史学家的首要职责是如实讲述他所见的真相，无论这会取悦还是触怒何人。

沉默是喜悦的最佳使者。

Investing in clean coal technologies isn't an expense—it's an investment in our future.

Never, ever give up.

信任是每一段牢固关系的基础，无论是与员工、合作伙伴还是客户。