Definition: a situation in which people are fighting or arguing Level: B2
足球比赛结束后，当愤怒的球迷开始打架时，体育场外发生了一些骚乱。
After the football match, there was some ___trouble outside the stadium when angry fans started fighting.
一切都很平静，直到大厅后面的两个群体之间发生了冲突。
Everything was calm until the ___trouble started between the two groups at the back of the hall.
