When public speaking， pause frequently. Pause before you say something in a new way， pause after you have said something you believe is important， and pause as a relief to let listeners absorb details.

The only way to get better is to compete against the best.

世界是我们共享的梦。

合作是解决科学领域最大挑战的关键。

历史感不仅包含对过去之过去的感知，还包含对过去之现在的感知。