trooping along 成群走过
trooping in groups 成群结队地
trooping through 穿过（人群）
A: Look! Why are those people trooping toward the park?
A：看！为什么那些人正成群结队地向公园走去？
B: I think there is a music festival happening there today.
B：我想今天那里正在举办音乐节。
1) 成群结队地移动
2) 行军，行进
3) 聚集
1. 成群结队地移动；聚集
present participle
1. moving in a group or crowd
Synonym: marching, gathering, crowding