原始的；

1. 原始的：rotation interlocking 旋转联锁 | primaeval 原始的 | pneumatic piston actuating mechanism 气动活塞执行机构

1. having existed from the beginning
    in an earliest or original stage or state

    e.g. aboriginal forests
           primal eras before the appearance of life on earth
           the forest primeval
           primordial matter
           primordial forms of life

    Synonym: aboriginalprimalprimevalprimordial