VOA慢速英语:巴西科学家计算亚马逊雨林的碳含量

machete – n. a large, heavy knife that is used for cutting plants and as a weapon

sample – n. a small amount of something that gives you information about the thing it was taken from

role – n. a part that someone or something has in a particular activity or situation

management – n. the act or process of deciding how to use something

panel – n. a group of people with special knowledge, skill, or experience who give advice or make decisions

underbrush – n. plants, bushes, and small trees growing under larger trees in a forest

lumber – n. wooden boards or logs that have been sawed and cut for use

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