外交官、历史学家和其他长期为此案努力的人员表示，之前俄罗斯安全部门一直否认存在这样的文件。

Previously, the security service denied that any such files existed, according to diplomats, historians and others who have long worked on the case.

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埃利斯借鉴了其他作家和历史学家的记录，并且时常回到猎人对北极熊生存所构成的威胁上来。

Mr Ellis draws on the accounts of other writers and historians, and often returns to the threat that hunters pose to the survival of the species.

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《吉尔伽美什史诗》(The Epic of Gilgamesh)：与其他古籍一样，历史学家和文学批评家们无法确定《吉尔伽美什史诗》写成的确切日期，不过很可能是公元前2000年左右。

The Epic of Gilgamesh: as with other ancient texts, historians and literary critics cannot pinpoint the exact date when the Epic of Gilgamesh was written, though it was likely around 2000 BCE.

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