It is thick- er near the foot of the cone, and thinner far from the cone, indicating a high volatile con- tent in magma and strong ex- plosion.是什么意思_It is thick- er near the foot of the cone, and thinner far from the cone, indicating a high volatile con- tent in magma and strong ex- plosion.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句