我当时主攻的是英国历史和文学，而我感兴趣的是十七和十八世纪。
And I majored in English History and Literature, but I was interested in the 16th and 17th centuries.
在十七世纪和十八世纪，整个遗址被一层坚硬的灰色粘土覆盖，这极大减少了进一步的侵蚀。
During the seventeenth and eighteenth centuries, the entire site became covered with a layer of hard grey clay, which minimised further erosion.
在十七世纪和十八世纪，大部分钓鱼船从波斯顿出发前往下东寻找鳕鱼。
In the 17th and 18th centuries, most of the fishing boats sailing downeast from Boston were looking for cod.
虽然希腊的几何学仍然占有重要的地位，但是，希腊人关于公理体系和系统推演的思想在十七世纪和十八世纪不复出现。
While Greek geometry retained an important place, the Greek ideal of axiomatic crystallization an systematic deduction disappeared in the seventeenth and eighteenth centuries.
虽然希腊的几何学仍然占有重要的地位，但是，希腊人关于公理体系和系统推演的思想在十七世纪和十八世纪不复出现。
While Greek geometry retained an important place, the Greek ideal of axiomatic crystallization an systematic deduction disappeared in the seventeenth and eighteenth centuries.
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