无人机的安全性不是选项，而是底线。
Drone safety is not an option, but a baseline.
文学和科学相比，的确没什么用处，但文学最大的用处，也许就是它没有用处。
No one is an artist unless he carries his picture in his head before painting it.
虽然天地能长久，但岁月不居。等待黄河水复清只会陷入烦恼。宁愿远游，让自己心情好一些，不怕上天入地，游尽上下四方。
The past is never dead. It's not even past.
"Deep learning is a form of machine learning that enables computers to learn from experience and understand the world in terms of a hierarchy of concepts."