VOA慢速英语:美国的远程教育

martial – n. of or relating to combat, fighting, war or soldiers

stress - n. a state of mental tension and worry caused by problems in your life, work, etc.

sanitizer - n. a chemical substance designed to kill germs

negative - adj. not showing the presence of a particular germ, condition, or substance

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

hub – n. the central and most active part or place

foster -- adj. always used before a noun used to describe a situation in which for a period of time a child lives with and is cared for by people who are not the child's parents

museum -- n. a building in which interesting and valuable things (such as paintings and sculptures or scientific or historical objects) are collected and shown to the public