侯国位于帝国，王国，公国之下。往往附属于帝国或公国。侯国对内有一定的自主权，如法律，关税等。但政治，侯国外交上受到宗主国的限制。
在伟大的变革之下，秦变得强大起来，统一了所有的诸侯国，成为中国的第一个帝国。
Under the great reforms, Qin grew strong and united all the states, becoming the first empire of China.
长城始建于春秋战国时代，当时各诸侯国为了防御而在险要地区筑起城墙。
The construction of the Great Wall began during the periods of Spring and Autumn and Warring States, when the princedoms built separate sections in scattered strategic areas for defence.
应国是我国西周时期中原地区的一个小诸侯国。
Ying State was a feudal princedom in Central Plains in the Western Zhou period.
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