Then how can we say the force on two mirrored sides, like force  left and force right, are equal in magnitude?

那么我们怎么能说两个镜像边上的力，比如左力和右力， 大小相等呢？

However, due to symmetry, the  forces at the same depth on each mirrored side have the same magnitude, and therefore cancel out.

然而， 由于对称性， 每个镜像侧相同深度处的力具有相同的大小，因此相互抵消。

Now, again, if you're in the driver's seat, if you are the driver, you can call it your " driver side mirror" , or if you're a passenger, you can also call it the " passenger side mirror" .

再一次，如果你坐在驾驶座上，如果你是司机， 你可以称它为你的“驾驶员后视镜” ，或者如果你是乘客， 你也可以称它为“乘客侧后视镜” 。