VOA慢速英语:微小的新冠病毒空气颗粒可能是威胁

cone – n. a shape that has a pointed top and sides that form a circle at the bottom

alphabet – n. the letters of a language arranged in their usual order

cough – n./v. to force air through your throat with a short, loud noise often because you are sick

sneeze – n./v. to suddenly force air out through your nose and mouth with a usually loud noise because your body is reacting to dust, a sickness, etc.

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

ventilation – n. a system or means of providing fresh air

aerosol – n. a substance (such as hair spray or medicine) that is kept in a container under pressure and that is released as a fine spray when a button is pressed

transmission – n. the act or process by which something is spread or passed from one person or thing to another

ultraviolet – adj. technical —used to describe rays of light that cannot be seen and that are slightly shorter than the rays of violet light