idiosyncrasy的复数形式怎么拼写？

The book is a gem of Victorian idiosyncrasy.这本书展现了维多利亚时代特色的精华。It was his idiosyncrasy to seem much older than his years.他的特点是看起来比实际年龄苍老得多.Perhaps the intense loyalty that these firms inspire is just an interesting idiosy...

idiosyncrasy的音标：idiosyncrasy的英式发音音标为：[ˌɪdiə'sɪŋkrəsi]idiosyncrasy的美式发音音标为：[ˌɪdio'sɪŋkrəsi]...

n.（某人特有的）气质，习性，癖好...