对……提出了更高的要求 用英文怎么翻译？

greater demands are being placed on sb./place a greater demand on sb.
对……提出了更高的要求

e.g.
Greater demands were being placed on the police by growing violence and left- and right-wing extremism.
暴力事件和左右翼极端主义日益猖獗，这对警方提出了更高的要求。

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