慢速英语:科学家们在埃博拉病毒治疗方面取得了进展

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contract(ed) – v. to become ill with a disease

outbreak – n. a sudden start or increase of fighting or disease

occur(s) – v. to happen

strain(s) – n. a kind or sort of something

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

expensive – adj. costing a lot of money

sponsor(ed) – v. to support, take responsibility for or pay for someone or something