When two clouds get close to each other, with their regions oppositely charged, the air insulation breaks down and lightning occurs.

当两个云团彼此靠近，它们的区域相反地带电时，空气绝缘层就会破裂，闪电就会发生。

Okay, outside  the two parallel, oppositely charged planes, the electric fields are equal in magnitude, however,   they are opposite in direction, therefore the electric field outside the two parallel planes of  charge is zero.

好的， 在两个平行的、带相反电荷的平面之外，电场的大小相等，但是方向相反，因此两个平行电荷平面之外的电场为零。