n.反射极(弹回装置；栏板)
A country must have the will to repel any invader. 一个国家得有决心击退任何入侵者。
North magnetic poles repel (each other). 磁北极与磁北极互相排斥。
Opposite poles attract, like poles repel. 同性相斥，异性相吸。
Like charges repel each other, but opposite charges attract. 同种电荷互相排斥，但异种电荷却互相吸引。
Molecules repel each other when they collide. 当分子相碰撞时彼此互斥。
Fire and water repel each other. 水火不相容。
