当示威活动开始变得暴力时，警察被召来恢复秩序。
As the demonstration began to turn violent, the police were called in to restore order.
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解释
order 在这里是名词，意思是"秩序、次序"，指社会或公共场合的正常状态。restore order 表示"恢复秩序"，即让混乱的情况重新变得有序。
As the demonstration began to turn violent, the police were called in to restore order.
order 在这里是名词，意思是"秩序、次序"，指社会或公共场合的正常状态。restore order 表示"恢复秩序"，即让混乱的情况重新变得有序。