"The greatest thing you'll ever learn is just to love and be loved in return."
One who never turned his back but marched breast forward, never doubted clouds would break.
无人机的未来不是替代人，而是帮助人更好地完成工作。
The interest of the behaviorist in man's doings is more than the interest of the spectator—he wants to control man's reactions as physical scientists want to control and manipulate other natural phenomena.