vi·a·ble /ˈvaɪəbəl/
  (a.)能養活的,能生育的
  vi·a·ble /ˈvaɪəbəl/ 形容詞
  有活力的,有生機的
  Vi·a·ble a.  Law Capable of living; born alive and with such form and development of organs as to be capable of living; -- said of a newborn, or a prematurely born, infant.
     VIABLE, Vitae  habilis, capable  of living.  This is said of a child who is born alive in such an advanced state of formation as to be capable of living.  Unless be is born viable he acquires no rights and  cannot transmit them to his heirs, and is considered as if he had never been born.   --Bouvier (Law Dictionary, 1856).
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  viable
       adj 1: capable of being done with means at hand and circumstances
              as they are [syn: feasible, executable, practicable,
               workable]
       2: capable of life or normal growth and development; "viable
          seeds"; "a viable fetus"