《徐霞客游记·江右游日记六》
再往上游行二里，就是石箭滩，滩中乱石填塞，流水很急。
再上二里，即石箭滩，乱石填塞，溪流甚急。
Two miles further upstream was the Shijian Shoal, which was filled with boulders and had very fast water.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 再上二里，即石箭滩，乱石填塞，溪流甚急。 [/INST] Two miles further upstream was the Shijian Shoal, which was filled with boulders and had very fast water.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 再上二里，即石箭滩，乱石填塞，溪流甚急。
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Two miles further upstream was the Shijian Shoal, which was filled with boulders and had very fast water.
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