VOA慢速英语:人类因疫情被困家中 地球反而变得更加美好

smog - n. fog mixed with smoke : a cloud of dirty air from cars, factories, etc., that is usually found in cities

asthmatic - n. relating to or suffering from asthma (a physical condition that makes it difficult for someone to breathe)

park - n. a piece of public land in or near a city that is kept free of houses and other buildings and can be used for pleasure and exercise

nest - v. to build or live in a nest

undisturbed - adj. not moved, changed, touched, etc., by anyone or anything

catastrophic - adj. a terrible disaster

silver lining - idiomatic expression. something good that can be found in a bad situation