con·cen·tric /kənˈsɛntrɪk, ˌkɑn-/
  (a.)同中心的,集中性的
  con·cen·tric /kənˈsɛntrɪk, (ˈ)kɑn-/ 形容詞
  同心的,具同心環紋的
  Con·cen·tric Con·cen·tric·al, a.  Having a common center, as circles of different size, one within another.
     Concentric circles upon the surface of the water.   --Sir I. Newton.
     Concentrical rings like those of an onion.   --Arbuthnot.
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  Con·cen·tric, n. That which has a common center with something else.
     Its pecular relations to its concentrics.   --Coleridge.
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  concentric
       adj : having a common center; "concentric rings" [syn: concentrical,
              homocentric] [ant: eccentric]