How about at that angle,

从这个角度
how much light is going to be coming out from these two electrons?

有多少波从两个电子散射出来呢
None, they exactly cancel each other,

没有它俩刚好相互抵消了
But if I go to this angle,

但如果变到这个角度
now they're just as strong as they were originally, right?

散射出的波强度就没有发生变化
And then it'll go weak, weak, weak, weaker, weakest, nothing;

然后减弱减弱直到最弱等于零
then stronger, stronger, stronger, stronger, very strong,

随后增强增强直到最强
weaker, weaker, weaker, weaker, weaker, zero.

再减弱减弱减小到零
So there'll be a modulation

可见角度是关键
as you go out at different angles here, going either up or down

当沿着角度去观察时
it'll be strong, then nothing, then strong, then nothing

就会观察到增强再减弱两者交替出现
strong then nothing. Right?

形成明暗相间的条纹是吧