《明史·志·卷五十九》
朱衡于是上奏说： 黄河之南多次遭受黄河水患，大修堤防，现在幸亏有了数十年的安定，因为防守严密而且预先又有防备。
衡乃上言： 河南屡被河患，大为堤防，今幸有数十年之安者，以防守严而备御素也。
Zhu Heng thereupon memorialized the throne saying: The lands south of the Yellow River have suffered repeated floods from the Yellow River, and huge amounts have been spent on building dikes. Now that we have had more than ten years of peace, it is only because the defense has been strict and we have been prepared in advance. 
<s>[INST] Convert the following modern Chinese text into Classical Chinese: 朱衡于是上奏说： 黄河之南多次遭受黄河水患，大修堤防，现在幸亏有了数十年的安定，因为防守严密而且预先又有防备。 [/INST] 衡乃上言： 河南屡被河患，大为堤防，今幸有数十年之安者，以防守严而备御素也。</s>
Convert the following modern Chinese text into Classical Chinese: 朱衡于是上奏说： 黄河之南多次遭受黄河水患，大修堤防，现在幸亏有了数十年的安定，因为防守严密而且预先又有防备。
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衡乃上言： 河南屡被河患，大为堤防，今幸有数十年之安者，以防守严而备御素也。
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