VOA慢速英语:两种实验药物对埃博拉病毒有效

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monitoring – adj. related to watching or observing for a special purpose over a period of time

hemorrhagic – adj. related to too much or uncontrolled bleeding

mortality – n. the number of deaths that happen in a place or over a period of time

symptom –n. changes in the body that show a disease is present