当地底下的压力生成时，岩浆喷发。
Magma extravasated as pressure built under ground.
youdao
火山喷发时人们很少被岩浆碰上。
Rarely are people caught by lava when a volcano erupts.
首先是玄武岩浆从中间喷发，构成火山。
Basaltic lava first erupted from the center and built up the volcano.
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