perceivable
  (a.)可察覺的,可看到的
  per·ceiv·able /-ˈsɪvəbəl/ 形容詞
  Per·ceiv·a·ble a. Capable of being perceived; perceptible. -- Per*ceiv*a*bly, adv.
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  perceivable
       adj 1: capable of being perceived especially by sight or hearing;
              "perceivable through the mist"
       2: capable of being apprehended or understood [syn: apprehensible,
           intelligible, graspable, understandable]