环球之旅:邀你同行共赏美丽火山风景(上)

While walking on this comfortable volcanic sand, you may feel that there is nothing but vacuum or a material with a high content of air under your feet.

当你行走在舒服的火山砂上，可能只会感觉到真空。或者说，有一块高舒适度的气垫材料在你脚下。

《环球之旅:邀你同行共赏美丽火山风景(上)》永久阅读地址: http://91kudian.com/yingyu/4080/