《南史·列传·卷五十三》
侯景之军所以未即攻打江南之地，正因为藩国屏卫坚固，宗室各镇强密。
侯景之军所以未窥江外者，政爲蕃屏盘固，宗镇强密。
The reason why Hou Jing's army did not immediately attack the south was because the vassals' lines of defense were strong, and each of the imperial clansmen in each military town was powerful.
<s>[INST] 请提供这段文言文的现代汉语解释: 侯景之军所以未窥江外者，政爲蕃屏盘固，宗镇强密。 [/INST] 侯景之军所以未即攻打江南之地，正因为藩国屏卫坚固，宗室各镇强密。</s>
请提供这段文言文的现代汉语解释: 侯景之军所以未窥江外者，政爲蕃屏盘固，宗镇强密。
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侯景之军所以未即攻打江南之地，正因为藩国屏卫坚固，宗室各镇强密。
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