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VOA慢速英语:世卫专家称新冠病毒可能从动物传到人类
2021-02-10来源:和谐英语
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outbreak –n. the sudden start of fighting or the appearance of a disease that can spread widely
hypothesis –n. an idea or theory that is not proven but that leads to further study; a proposition that is to be tested by an experiment using the scientific method
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