语法与词汇 Scientists established several years ago that in many land areas north of the Arctic Circle, the spring snowmelt now comes earlier every year.无

【正确答案】Establish means to discover or prove the facts of a situation.

【答案解析】句意：科学家们还在几年前就已证实，在北极圈以北的许多地区，春季雪融的时间逐年提前。 establish指“证实”。