quirk

One of his personality quirks is that he always wears mismatched socks for good luck.

(Chinese) 他的性格怪癖之一是，为了好运他总是穿着不配套的袜子。

The old car has a few quirks, such as the radio only working when you turn left.

(Chinese) 这辆旧车有些小毛病（怪癖），比如收音机只有在左转时才响。