VOA慢速英语:世卫组织宣布新型冠状病毒构成全球大流行

pandemic – n. an occurrence in which a disease spreads very quickly and affects a large number of people over a wide area or throughout the world

detect – v. to discover or notice the presence of (something that is hidden or hard to see, hear, taste, etc.)

isolate – v. to put or keep (someone or something) in a place or situation that is separate from others

trace – v. to follow (something) back to its cause, beginning, or origin; to find out where something came from

mobilize- v. to bring (people) together for action

live-stream – v. to broadcast (an event) on the internet as it happens

tough – adj. very difficult to do or deal with

scared – adj. frightened