used to refer to a group of people who are the first of several groups to do something, or to the first part of an activity that later happens again or is repeated after a pause

First-wave adopters learnt from the problems of being early users. 作为早期用户，第一批使用者从这些问题中吸取了教训。

Captain Hillier and company made a suicidal first-wave assault on the beaches of Normandy. 希利尔上尉和他带领的连队对诺曼底海滩发动了自杀式的第一波攻击。