有效周边长的英文：
effective circumference

effective是什么意思：
adj. 有效的；生效的，起作用的；有力的；实际的
  • This parameter has no effect.
    此参数不起作用。
  • The drug was of no effect.
    这药无效。
  • The helpful effect on propellant slosh effects was a secondary consideration
    推进剂晃动的有利性影响是一个次要的考虑因素。
  • She only dresses like that for the effect it creates/for effect.
    她仅仅为了装样子才那样打扮.
  • The medicine was an effective purge.
    这是疗效很好的泻药。
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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