translation.en: Let's tell the quad to come back here and let the pole drop, and I will next demonstrate the importance of understanding physical models and the workings of the physical world.
translation.zh: 我们让这个四轴飞行器回到这里， 把杆子取下来。 我接下来将演示 理解物理模型 和物理世界运作的重要性。