[; ] () () the situation that occurs on the third Friday of March, June, September and December when three types of futures and options reach the end of the time when they are valid三巫聚首（3 月、6 月、9 月及 12 月的第三个星期五，三种类型的期货和期权同时到期）◆triple-witching day/hour三巫聚首日／时刻➡double-witching