《徐霞客游记·粤西游日记三十三》
不久本地人秦徐来到，为我举着火把在前领路，仍从山口出来，沿南山的东麓转到此山的南麓，开始沿石阶上登，走到一处朝向东南的洞口，这是后洞，正对着卓笔峰、青狮岩诸峰。由洞中向东北上登，就暗下来需要火把；再转向北，那上面非常陡峻，远望天光透射到洞中了。更加踊跃攀登，找到一处仅如手掌宽的缝隙，俯瞰缝隙外边，辟开一个巨大的门洞，是上洞的下层。
既而土人秦余至，为秉炬前导，仍从山口出，循南山之东而转其南始拾级上，得一门东南向，是为后洞，由洞中东北上跻，乃暗而需炬，更转而北，其上甚峻，遥望天光中透矣，益攀跃以升，得一隙仅如掌，瞰其外辟巨门焉，则上洞之下层也。
Soon the local Qin Xu arrived, holding a torch to lead the way in front of me. He still came out from the pass, turned along the eastern foot of Nanshan to the southern foot of this mountain, and began to climb up along the stone steps. He walked to a cave entrance facing southeast, which was the back cave, directly facing peaks such as Zhuobi Peak and Qingshiyan. Climbing northeast from the cave, it becomes dark and requires a torch; turning north again, it is very steep above, and the sky can be seen from a distance. Climbing more vigorously, I found a crack that was only as wide as a palm. Looking down from outside the crack, I saw a huge gate洞, which was the lower level of the upper cave.
<s>[INST] Provide a modern Chinese interpretation of the following Classical Chinese passage: 既而土人秦余至，为秉炬前导，仍从山口出，循南山之东而转其南始拾级上，得一门东南向，是为后洞，由洞中东北上跻，乃暗而需炬，更转而北，其上甚峻，遥望天光中透矣，益攀跃以升，得一隙仅如掌，瞰其外辟巨门焉，则上洞之下层也。 [/INST] 不久本地人秦徐来到，为我举着火把在前领路，仍从山口出来，沿南山的东麓转到此山的南麓，开始沿石阶上登，走到一处朝向东南的洞口，这是后洞，正对着卓笔峰、青狮岩诸峰。由洞中向东北上登，就暗下来需要火把；再转向北，那上面非常陡峻，远望天光透射到洞中了。更加踊跃攀登，找到一处仅如手掌宽的缝隙，俯瞰缝隙外边，辟开一个巨大的门洞，是上洞的下层。</s>
Provide a modern Chinese interpretation of the following Classical Chinese passage: 既而土人秦余至，为秉炬前导，仍从山口出，循南山之东而转其南始拾级上，得一门东南向，是为后洞，由洞中东北上跻，乃暗而需炬，更转而北，其上甚峻，遥望天光中透矣，益攀跃以升，得一隙仅如掌，瞰其外辟巨门焉，则上洞之下层也。
user
不久本地人秦徐来到，为我举着火把在前领路，仍从山口出来，沿南山的东麓转到此山的南麓，开始沿石阶上登，走到一处朝向东南的洞口，这是后洞，正对着卓笔峰、青狮岩诸峰。由洞中向东北上登，就暗下来需要火把；再转向北，那上面非常陡峻，远望天光透射到洞中了。更加踊跃攀登，找到一处仅如手掌宽的缝隙，俯瞰缝隙外边，辟开一个巨大的门洞，是上洞的下层。
assistant