有效周邊長的英文：
effective circumference

effective是什么意思：
adj. 有效的；生效的，起作用的；有力的；實(shí)際的
  • This parameter has no effect.
    此參數(shù)不起作用。
  • The drug was of no effect.
    這藥無效。
  • The helpful effect on propellant slosh effects was a secondary consideration
    推進(jìn)劑晃動的有利性影響是一個次要的考慮因素。
  • She only dresses like that for the effect it creates/for effect.
    她僅僅為了裝樣子才那樣打扮.
  • The medicine was an effective purge.
    這是療效很好的瀉藥。
circumference是什么意思：
n. 圓周，周長
  • An arc is a part of the circumference of a circle or other curved lines.
    弧是圓周或曲線的一部分。
  • The recruit made the current circulate in the circuit on the circumference.
    新兵使電流在周長上在電路內(nèi)循環(huán)。
  • The ratio of circumference to diameter is approximately 3.1416.
    圓周長與直徑的比大約是3.1416。
  • A point equidistant from all points on the circumference of a circle or on the surface of a sphere.
    圓心，球心與一圓周上或一球面上所有點(diǎn)等距的一點(diǎn)
  • Cut the salmon into long strips and wrap it round the circumference of the bread.
    把鮭魚切成長條，纏裹在面包上。

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