in·sep·a·ra·ble /(ˌ)ɪnˈsɛp(ə)rəbəl/
  (a.)不可分離的,分不開的
  In·sep·a·ra·ble a.
  1. Not separable; incapable of being separated or disjoined.
     The history of every language is inseparable from that of the people by whom it is spoken.   --Mure.
     Liberty and union, now and forever, one and inseparable.   --D. Webster.
  2. Gram. Invariably attached to some word, stem, or root; as, the inseparable particle un-.
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  inseparable
       adj : not capable of being separated; "inseparable pieces of rock"