1.  perimeter
2.  circumference

• 1. 周界的: peripheral
• 2. 周界长度: perimeter
• 3. 流域周界: basin perimeter

更多释义

• 1.一道篱笆标明了那块田地的周界。
  A fence marked the perimeter of the field.
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• 2.我希望，同时预计，周界所会做出重大发现。
  I am hoping, and expecting, great things will happen there.
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• 3.这承重预制墙，由一薄板及沿其周界有一加固用的框架所组成。
  This load supporting prefabricated wall consists of a thin plate reinforced along its boundaries by a frame.
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