VOA慢速英语:新学年伊始 教师死亡事件敲响警钟

guidelines – n. a rule or instruction that shows or tells how something should be done — usually plural

infrastructure - n. the basic equipment and structures (such as roads and bridges) that are needed for a country, region, or organization to function properly

(school) district - n. an area or region containing the schools that a school board is in charge of

quarantine - v. to keep (a person or animal) away from others to prevent a disease from spreading

contact tracing - n. the process of identifying people who may have been physically close to an infected person.

asthma - n. a physical condition that makes it difficult for someone to breathe