mega-colossalWiktionary 原文英美构词拆解mega-前缀+colossal词干mega-(originally) Very large, great. · In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by one million (106).词源说明From mega- + colossal.释义形容词adjective1Describing the very largest type of volcanic eruption, the kind that would be expected to happen less than once in ten thousand years.