VOA慢速英语:研究预测美国人口中心将面临极端温度提升

exposure – n. coming in contact with something

migration – n. when people move to another place, often a different country

standard – n. a level of quality, achievement, etc., that is considered acceptable or desirable

absolute – adj. complete

factor – n. one of the things that has an effect on a particular situation, decision, event, etc.

source – n. where something comes from