in·dis·cern·ible /ˌɪndɪˈsɚ/
  (a.)難識別的,看不見的
  In·dis·cern·i·ble a.  Not to be discerned; imperceptible; not discoverable or visible.
     Secret and indiscernible ways.   --Jer. Taylor.
  -- In*dis*cern*i*ble*ness, n. -- In*dis*cern*i*bly, adv.
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  indiscernible
       adj 1: difficult or impossible to perceive or discern; "an
              indiscernible increase in temperature" [ant: discernible]
       2: barely able to be perceived; "the transition was almost
          indiscernible"; "an almost insensible change" [syn: insensible,
           undetectable]