Flashmob
n. 快闪族：通过网络召集大量互不相识的人; 约定时间在某一地点集中; 闪烁暴徒; A group of people who appear from out of nowhere
🗣️ 情景例句
Building a city can be a disaster for the environment.
新建一个城市对于环境来说可能是一场灾难。
I asked him to do it for me, but he wouldn't.
我请他帮我做，但是他不肯。
Help yourself.
别客气。