That volcanologist was busying with memoir after his retirement.自从退休以后,那位火山学家一直忙于撰写回忆录....

n.火山学家...

volcanologist的音标：volcanologist的英式发音音标为：[ˌvɒlkən'ɒlədʒɪst]volcanologist的美式发音音标为：[ˌvɒlkən'ɒlədʒɪst]...