基本解释古岛弧同根派生 paleo-arc相关词英汉例句This area was in an arc and rear-arc basin on convergent plates in the Middle Devonian.其岩石化学及地球化学显示岛弧火山岩特征。Most of the islands are part of a geologically unstable and volcanically active island arc.多数岛屿在地理上都是不稳定的火山活动岛弧。paleo-arc更多例句