The original castle was probably built about AD 860.
原先的城堡可能是在公元860年前后修建的。
Middle English was spoken from about aD 1100 to 1450.
中古英语约在公元1100年到1450年之间使用。
You are the son of a Mayan soothsayer or holy man, living near the city of Copan in about AD 710.
你是一名玛雅占卜师的儿子，你们生活在公元710年的科潘·玛雅古城附近。
The English spoken between about AD 450 and 1150 was very different from the English spoken today.
从公元450年到1150年，人们所说的英语跟今天所说的英语就很不一样。
Actually, the English spoken between about AD 450 and 1150 was based more on German than present day English.
实际上，从公元450年到1150年，人们所说的英语更多的是以德语为基础的，而现代英语不是。
At first the English spoken in England between about AD 450 and 1150 was very different from the English spoken today.
开始，英格兰人在大约公元450年到1150年之间所说的英语与我们今天所说的英语很不一样。
Although we had some knowledge of the etiology, gene location, diagnosis and therapy of AD, there are still a lot of unknown field about AD need to be done.
虽然目前有关AD的发病机制、基因定位以及诊断和治疗方面已经取得了很多成就，但仍有许多未知领域有待于进一步探索。
Although we had some knowledge of the etiology, gene location, diagnosis and therapy of AD, there are still a lot of unknown field about AD need to be done.
虽然目前有关AD的发病机制、基因定位以及诊断和治疗方面已经取得了很多成就，但仍有许多未知领域有待于进一步探索。
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