Different kinds of activities, such as commenmorative meetings, planting trees,
举行各种各样的活动,例如召开纪念大会,植树造林,
She always referred to them as 'the shifting population', for they came and went with such frequency that I never even got a chance to learn their names.
她称这些佣人叫“流动人口”,因为他们来匆匆,所以我甚至都没有机会知道他们的姓名。