VOA慢速英语:Black Death Older Than We Thought

fossil – n. preserved from a past geologic age : fossilize – v. to become changed into a fossil

transmit – v. to cause to be given to others, such as a virus or disease

gene – n. biology : a part of a cell that controls or influences the appearance, growth, etc., of a living thing (genomic, genetic

stowaway – n. someone who hides on a ship, airplane, etc., in order to travel without paying or being seen

outbreak – n. a sudden start or increase of fighting or disease

flee – v. to run away from danger : to run away from (a place)

migrant – n. a person who goes from one place to another especially

rare – adj. seldom occurring or found : uncommon

quarantine – v./n. the period of time during which a person or animal that has a disease or that might have a disease is kept away from others to prevent the disease from spreading