同时出发 meaning in English

collective start
simultaneous start

Cardmember and companion must travel together
会员及同行者必须同时出发及回程
In the small hours of 19 september 1979 , more than 100 investigators from the operations department assembled at the icac headquarters for operation briefings . the investigators were separated into 50 or so " action units " of two or three persons each for simultaneous raids on two sets of target locations
一九七七年九月十九日的凌晨，百多位执行处调查员聚集在办公室，听取行动指令，然后分成五十多个行动小组，每组两至三个人，分两路同时出发。