It is like a long dragon, it makes a rumble sound when it walks. it will run on a iron bridge when come across a river and drill cave when come across a mountain.
长长一条龙，走路轰隆隆，遇水过铁桥，遇山钻山洞。
In this part of the cave, they could hear an insistent booming sound.
在洞穴的这块地方，他们能够听到持续的轰响。
This cave gives(you) back the sound of your voice.
这个岩洞能把你的声音折回来。
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