perspicuity
  明晰,明瞭,簡明
  Per·spi·cu·i·ty n.
  1. The quality or state of being transparent or translucent. [Obs.]
  2. The quality of being perspicuous to the understanding; clearness of expression or thought.
  3. Sagacity; perspicacity.
  Syn: -- Clearness; perspicuousness; plainness; distinctness; lucidity; transparency. See Clearness.
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  perspicuity
       n : clarity as a consequence of being perspicuous [syn: perspicuousness,
            plainness]