他们说这是头一次发现蒙古入侵船只如此大的一块外壳。
They said it was the first time such a large piece of hull had been recovered from the Mongol invasion fleets.
波斯文明在智力和艺术方面一直是令人赞羡的。但自从十三世纪遭受蒙古入侵后便一蹶不振了。
Persian civilization remained both intellectually and artistically admirable until the invasion of the Mongols in the thirteenth century, from which it never recovered.
他决定修建一条防止蒙古人再次入侵的城墙，于是便开始了建造长城的漫长历史。
He decided that a wall should be built to prevent those Mongols invading again. So he started the long history of Great wall building.
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