idiosyncrasy
/ˌɪdɪəʊˈsɪŋkrəsɪ/noun
(pl. -ies)(一般作idiosyncrasies)
1- a mode of behaviour or way of thought peculiar to an individual癖好, 癖性：
one of his little idiosyncrasies was always preferring to be in the car first.
他的小癖好之一就是总喜欢第一个上车。
1.1
- a distinctive or peculiar feature or characteristic of a place or thing（地点、事物的）特色, 特性：
the idiosyncrasies of the prison system.
监狱系统的特色。
1.2
- Medicine an abnormal physical reaction by an individual to a food or drug【医】（对食物、药物的）特（异反）应性。
词源
early 17th cent. （originally in the sense 'physical constitution peculiar to an individual'）： from Greek idiosunkrasia, from idios 'own, private' + sun 'with' + krasis 'mixture'.