Volcanic caves mainly are lava tube type?pyrodastic type cave and volcanic-intrusive cave,with different genetic mechanism and high value of tourism.是什么意思_Volcanic caves mainly are lava tube type?pyrodastic type cave and volcanic-intrusive cave,with different genetic mechanism and high value of tourism.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句