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
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adj
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: aboriginal primal primeval primordial