知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 ” The cave is comfortably warm with average humidity, and a small muddy stream flows by way of it. Even though specialized tools isn’t needed, it’s highly recommended to deliver protecting equipment to prevent soil and guano staining as well as a trusty flashlight for navigation.   7 https://rg8888.org/