preeruptive stage

例句：

1. 1. The geologicalsurvey revealed the preeruptive stageof the volcano.
   地质调查揭示了火山的喷发阶段。
2. 2. Duringthe preeruptivestage, the magma isrising from the Earth's mantle.
   在喷发阶段，岩浆从地球地幔上升。
3. 3. The scientists were studyingthe preeruptive stage ofthe eruption.
   科学家们正在研究喷发的预喷发阶段。