Close relation in a place like London is a personal mystery as profound as chemical affinity.
在像伦敦这样的地方建立亲密关系是一个与化学亲和力一样深刻的个人谜。
英语百科
Chemical affinity
(重定向自Chemical affinities)
In chemical physics and physical chemistry, chemical affinity is the electronic property by which dissimilar chemical species are capable of forming chemical compounds. Chemical affinity can also refer to the tendency of an atom or compound to combine by chemical reaction with atoms or compounds of unlike composition.