semi-perimeter

常见例句

• Guards patrolled the perimeter of the airfield.
  衛兵沿機場四周巡邏。
• semi perimeter
  n. 半周長
• The perimeter of the airfield is protected by guard-dogs.
  機場外的環形防衛圈由警犬保衛著。
• The barbed wire fence round the perimeter discouraged intruders.
  周圍有鉄絲網阻止了外人闖入。
• Guards had been posted at several points around the perimeter.
  在環形防線上已佈置了幾処崗哨。
• A fence marked the perimeter of the field.
  一道籬笆標明了那塊田地的周界。
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