You have to get used to other people's quirks and foibles.你得习惯别人的怪癖和小缺点。
There is a quirk in the rules that allows you to invest money without paying tax.这些规章的奇怪之处在于其允许人们投资而不必缴税。
By some strange quirk/By an odd quirk of fate (= unexpectedly), we ended up on the same train.说来奇怪,我们结果上了同一辆火车。