《宋史·列传·卷一百七十一》
孟珙逐条论述长江上游的防御应该是有三道防线：请求设立副司及调关外都统的一个军到夔州，负责涪州南面以下的江面，这是第一道防线；加强鼎、澧二州的守备，这是第二道防线；加强辰、沅、靖、桂四州的守备，作为第三道防线。
珙条上流备御宜为藩篱三层：乞创制副司及移关外都统一军于夔，任涪南以下江面之责，为第一层；备鼎、澧为第二层；备辰、沅、靖、桂为第三层。
Meng Gong argued in detail that there should be three lines of defense along the upper reaches of the Yangtze River: request the establishment of a deputy and the dispatch of an army under the general outside the pass to Qizhou, which would be responsible for the section of the river south of Fuzhou. This was the first line of defense. Reinforce the defenses of Dingzhou and Lizhou. This was the second line of defense. Strengthen the defenses of Chen, Yuan, Jing, and Gui, which served as the third line of defense.
<s>[INST] Translate the following Classical Chinese text into modern Chinese: 珙条上流备御宜为藩篱三层：乞创制副司及移关外都统一军于夔，任涪南以下江面之责，为第一层；备鼎、澧为第二层；备辰、沅、靖、桂为第三层。 [/INST] 孟珙逐条论述长江上游的防御应该是有三道防线：请求设立副司及调关外都统的一个军到夔州，负责涪州南面以下的江面，这是第一道防线；加强鼎、澧二州的守备，这是第二道防线；加强辰、沅、靖、桂四州的守备，作为第三道防线。</s>
Translate the following Classical Chinese text into modern Chinese: 珙条上流备御宜为藩篱三层：乞创制副司及移关外都统一军于夔，任涪南以下江面之责，为第一层；备鼎、澧为第二层；备辰、沅、靖、桂为第三层。
user
孟珙逐条论述长江上游的防御应该是有三道防线：请求设立副司及调关外都统的一个军到夔州，负责涪州南面以下的江面，这是第一道防线；加强鼎、澧二州的守备，这是第二道防线；加强辰、沅、靖、桂四州的守备，作为第三道防线。
assistant