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????. ??? ?????? ??? ????????????? ??? ??????????????. ??? ????????. ??????????????????. 1???????. ?????????? ???????????????(1980-1987)???15~20m??????????589?,????480?,???29?,???79??????1??. ???? ?????,??????????????,???????????????? ??????????(Vertebrata),?????????????????????????(backbone, or vertebral column, or spine),????????????????,??????????????????????????,?????? .

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