Myelin is an insulator and speeds up the electrical signals zipping down the nerve fiber.

髓磷脂是一种绝缘体，可加快电信号在神经纤维中的传输速度。

Solar storms will even bend and break the magnetic field lines on the far side of the Earth, allowing charged particles to zip back down the field lines toward the north and south poles.

太阳风暴甚至会在距离地球很远的地方扭曲和破坏地球的磁力线，让带电粒子沿着磁力线落进北极和南极。