法厄同（Phaethon）贸然迁走太阳神的车，驾驶它遨游在天地间，但他又怎是好驭手，须臾之间，马车脱离了法厄同的控制，大地为之灼烧，幸好宙斯赶来救场，但可怜的法厄同被宙斯狠心击死，最后坠入波河。尤瓦尔·赫拉在《智人之上：从石器时代到AI时代的信息网络 ...

See? “By” originally means “bye” or byway. That’s why, in fact, some people still spell “by the by” as “by the bye”. By the way, “that is by the by or bye” in this sense (secondary) is an idiom that ...