tran·sience /ˈtræn(t)ʃ(i)ən(t)s; ˈtrænziən(t)s, ˈtræn(t)si; ˈtrænʒən(t)s, ʤən(t)s/
  頃刻,無常,虛幻
  Tran·sience Tran·sien·cy n. The quality of being transient; transientness.
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  transience
       n 1: an impermanence that suggests the inevitability of ending or
            dying [syn: transiency, transitoriness]
       2: the attribute of being brief or fleeting [syn: brevity, briefness]