196.An unusually severe winter occurred in Europe after the continent was blanketed by a blue haze resulting from the eruption of the Laki Volcano in the Europeans republic of Iceland in the summer of 1984. Thus, it is evident that major eruptions cause the atmosphere to become cooler than it would be otherwise.
做题没有疑问
请教题干中的 “than it would be otherwise.”怎么翻译?特别是这个otherwise