Meanwhile, in South America, there were marsupials, giant ground sloths, and huge cousins of the armadillo called glyptodons that moved north.

与此同时， 在南美洲，有袋类动物、巨型地懒和犰狳的巨大表亲雕齿兽向北迁移。

And it's in this isolation that  unique animals originated -- like giant ground sloths and armored glyptodons, the enormous relatives of today's armadillos.

正是在这种与世隔绝的环境中， 独特的动物诞生了——比如巨型地懒和铠甲雕齿兽，它们是当今犰狳的巨大亲戚。

They had been the coverings of those gigantic glyptodons or armadilloes of the pleiocene period, of which the modern tortoise is but a miniature representative.

它们是上新世时期那些巨大的雕齿兽或犰狳的覆盖物，而现代的陆龟只是其中的一个缩影。