happenvi.发生；碰巧；出现；偶遇Happening once in four years.每四年发生一次的Happening very rapidly or easily来得快的；来得容易的happen in a particular manner.以一种特定的方式发生。Happening by accident or chance.偶然发生的因某种事件或机会而发生Happening once every five years.每五年发生一次的

1. Nothing ever happens in this town.
   这小镇上什么事也没发生过。
2. Don't ask me. It seems to happen in the best-regulated families, nowadays.
   不用问我了。现在啊，家规虽严，事故难免嘛。