VOA慢速英语:研究称一种新型海藻在太半洋杀死珊瑚

atoll - n. a ring-shaped reef, island, or chain of islands formed of coral.

archipelago - n. a group of islands

nuisance - n. something that is annoying or destructive

species - n. a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.