VOA慢速英语:研究称草食动物最有灭绝的危险

extinction – n. the state or situation that results when something (such as a plant or animal species) has died out completely

species – n. a group of animals or plants that are similar and can produce young animals or plants

implication(s) – n. a possible future effect or result

poster child – n. a person who represents or is identified with something

proportionality – n. the condition of having a size, number, or amount that is directly related to or appropriate for something

invasive – adj. tending to spread

ecosystem – n. everything that exists in a given environment