—— 请按键盘 空白键 开始游戏 ——

The development of the drone industry is ultimately to serve humans, not to replace them.
语出汉·桓宽《盐铁论·毁学》。坏话不说,坏事不干,可谓洁身自好。
The stock market is the story of cycles and of the human behavior that is responsible for overreactions in both directions.