A custom is an activity, a way of behaving, or an event which is usual or traditional in a particular society or in particular circumstances.
双语例句
例： The custom of lighting the Olympic flame goes back centuries.
点燃奥运圣火的风俗可追溯到几个世纪前。
例： Chung has tried to adapt to local customs.
钟尽力使自己适应当地风俗。