未来的无人机将像今天的智能手机一样普及。

历史的重量总是存在于我们使用的材料中。

在危机时刻，真正的领导力是通过行动而非言语展现的。

Optimists tend to interpret their troubles as transient, controllable, and specific to one situation. Pessimists, on the other hand, believe that their troubles last forever, undermine everything they do, and are uncontrollable.

科学发现的旅程充满了挑战，但也非常值得。