《元史·列传·卷二十九》
城中居民因受围日久，一天半夜有二人从城上缒下来向围城元军报告了城内虚实，表示愿为内应。
城中之民受围日久，夜半，二人缒城叩营门，具告虚实，愿为内应。
The city's residents had been under siege for a long time. One night, two people descended from the city on ropes to report the true situation within the city to the Yuan army besieging it, and expressed their willingness to serve as inside agents.
<s>[INST] Provide a modern Chinese interpretation of the following Classical Chinese passage: 城中之民受围日久，夜半，二人缒城叩营门，具告虚实，愿为内应。 [/INST] 城中居民因受围日久，一天半夜有二人从城上缒下来向围城元军报告了城内虚实，表示愿为内应。</s>
Provide a modern Chinese interpretation of the following Classical Chinese passage: 城中之民受围日久，夜半，二人缒城叩营门，具告虚实，愿为内应。
user
城中居民因受围日久，一天半夜有二人从城上缒下来向围城元军报告了城内虚实，表示愿为内应。
assistant