I will switch every light bulb that's divisible by two.

我会按下编号能被2整除的那些灯泡。

I know that because two is divisible into eight.

我知道这个 因8能被2整除。

So in the 16th Century, Pope Gregory XIII tweak the system again so that leap ears would occur in any year that's divisible by four, but only in centuries that are evenly divided by 400, confusing, I know.

所以在16世纪，教皇格里高利十三世再次修改了系统，使发生在每四一次的份中，但只有能被400整除的份才是，令人困惑，我知道。