周长的英文：
perimeter
circumference

参考例句：
  • (in measurements)following the circumference
    (度量)周长
  • What is the perimeter of the polygon?
    这个多边形的周长是多少?
  • What is the perimeter of this polygon?
    这个多边形的周长是多少？
  • the perimeter of a rectangle
    一个矩形的周长
  • The circuit of the city walls is three miles.
    环绕本市城墙的周长是三英里。
  • This tree is 3 meters in girth.
    这棵树周长有三公尺。
  • A young tree measuring only 18 inches round
    周长仅18英寸的小树
  • This tree is 3 meters in girth.
    这棵树周长有三公尺。
  • Weeds grow around the house
    房屋四周长满了野草。
  • The circle has greater area than a regular polygon of the same perimeter
    圆的面积比同样周长的正多边形的面积大。
perimeter是什么意思：
n. 边界；外缘；周长
  • What is the perimeter of the polygon?
    这个多边形的周长是多少?
  • Iverson has the penetration ability and perimeter.
    艾佛森拥有突破和外围投射能力。
  • A fence marked the perimeter of the field.
    一道篱笆标明了那块田地的周界。
  • The perimeter of the airfield is protected by guard - dogs.
    机场外的环形防卫圈由警犬保卫着。
  • Guards have been posted at several point around the perimeter.
    在环形防线上已布置了几处岗哨。
circumference是什么意思：
n. 圆周，周长
  • An arc is a part of the circumference of a circle or other curved lines.
    弧是圆周或曲线的一部分。
  • The recruit made the current circulate in the circuit on the circumference.
    新兵使电流在周长上在电路内循环。
  • The ratio of circumference to diameter is approximately 3.1416.
    圆周长与直径的比大约是3.1416。
  • A point equidistant from all points on the circumference of a circle or on the surface of a sphere.
    圆心，球心与一圆周上或一球面上所有点等距的一点
  • Cut the salmon into long strips and wrap it round the circumference of the bread.
    把鲑鱼切成长条，缠裹在面包上。

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