用这条红线来区分两个不同的工作区域。
Use this red line to ___demarcate the two different working areas.
老师用粉笔在操场上划出了比赛场地的界限。
The teacher ___demarcated the playing field with chalk on the playground.
这条河流明确地划分了两个国家的边界。
The river ___demarcates the border between the two countries.
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