There have been five expulsions in this academic year alone.光是这一学年已有五人被开除。The government engaged in mass expulsions.政府大规模驱逐外国人。The two countries have each expelled another diplomat following a round of tit-for-tat expulsions.在一轮针锋相对的驱逐事件之后，两国各又驱逐了一名外交官。