河南郡

河南郡在军事地理方面的优势，由显性转为了隐性。

As a result , the advantage in military geography of the prefecture of Henan turned into less outstanding .

下篇主要从洛阳与河南郡东部防御体系两部分入手来着重进行分析。

Part two puts emphasis on the city of Luoyang and the defense system in the eastern part of the prefecture of Henan .

河南郡东部防御体系是河南郡应对外敌的主要区域。

The eastern defense system was the main part of the prefecture to confront enemies from the east .

在这个时代中，河南郡通过其军事地理优势，在东西双方势力的对抗中扮演了极为重要的角色。

During this period , the prefecture of Henan , depending on its advantage in military geography , played a very important part in the confrontation between the east and the west .

河南郡从刘邦起义到武帝时期，无论在地理还是政治格局之中，一直处于居中的位置。

From Liu Bang taking part in the uprising to the time of the Emperor Wudi , the prefecture of Henan was always located in the center , no matter of the geographic position or the political pattern .

另外，西汉前期对外以守势为主，对内主要目标是解决东部诸侯国问题，这样的政策有利于河南郡在时局中发挥自身的地理优势。

Besides , the foreign policy was defense before the period of the Emperor Wudi and the domestic one was to solve the problem of kingdoms in the east , which helped the prefecture of Henan to bring its geographic features into full play .

上篇先从总体上介绍河南郡的自然地理状况以及政区沿革，进而以河南郡为整体，讨论它在全国政治、军事格局中的作用。

Part one firstly gives an introduction of the physical geography and administrative evolution in the prefecture of Henan generally . And then , the function of the prefecture of Henan as a whole part is argued in the political and military pattern of the empire .

唐分属河北道怀州河内郡、河阳三城使孟州、河南道河南府河南郡、郑州荥阳郡。

Tang belong to Hanoi , pregnant Road Hebei county , III Heyang make Mengzhou City , Henan Province House Road , County of Henan , Zhengzhou Yang Ying County .