广义相对论在某种意义上就是引力场的理论。

"I think the first duty of a writer is to entertain."

Anon, who wrote so many poems without signing them, was often a woman.

译文：用镜子照自己，可以看见形体容貌，用心性照自己，可以遇见祸福吉凶。赏析：为人处世，我们要多思考自己的言行是否得当，多想想自己的举止是否会得罪他人。凡事都要反躬自省，以免招致祸患。

On marketing: "In the old world， you devoted 30% of your time to building a great service and 70% of your time to shouting about it. In the new world， that inverts."