VOA慢速英语:Study Shows Climate Change Is Affecting Bird Migration

conservation – n. the protection of animals, plants and natural resources

indicator - n. a sign that shows the condition or existence of something

species - n. a group of related animals or plants that is smaller than a genus

impacting - v. having a strong and often bad effect

doubly - adv. much more than usual or previously; to a much higher degree than usual; twice as much

documenting - v. creating a record of something through writing, film or photography

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