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.

當(dāng)你行走在舒服的火山砂上，可能只會(huì)感覺(jué)到真空。或者說(shuō)，有一塊高舒適度的氣墊材料在你腳下。

《環(huán)球之旅:邀你同行共賞美麗火山風(fēng)景(上)》永久閱讀地址: http://www.jiazhineng.cn/yingyu/4080/