老师发现很难维持班级秩序。

The teacher found it hard to keep her class in ___order.

观察员在场以在投票期间维持秩序。

Observers were present to preserve ___order during the voting.

当激烈争执爆发时，主席试图恢复秩序。

When heated disagreement broke out, the chairman tried to restore ___order.