superposition
 重疊,疊合,重合


 Su·per·po·si·tion n.  The act of superposing, or the state of being superposed; as, the superposition of rocks; the superposition of one plane figure on another, in geometry.

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 superposition
      n 1: (geology) the deposition of one geological stratum on
           another
      2: (geology) the principle that in a series of stratified
         sedimentary rocks the lowest stratum is the oldest [syn: {principle
         of superposition, superposition principle]
      3: (geometry) the placement of one object ideally in the
         position of another one in order to show that the two
         coincide
      4: the placement of one thing on top of another