《战国策·楚一·城浑出周》
所以楚王为什么不把新城作为楚国的郡县，这对保卫边邑太有利了。 
故楚王何不以新城为主郡也?边邑甚利之。
So why doesn't the king of Chu take Xincheng as a county of Chu? This is too good for defending the border town.
<s>[INST] Translate the following Classical Chinese text into modern Chinese: 故楚王何不以新城为主郡也?边邑甚利之。 [/INST] 所以楚王为什么不把新城作为楚国的郡县，这对保卫边邑太有利了。 </s>
Translate the following Classical Chinese text into modern Chinese: 故楚王何不以新城为主郡也?边邑甚利之。
user
所以楚王为什么不把新城作为楚国的郡县，这对保卫边邑太有利了。
assistant