VOA慢速英语:俄罗斯的永久冻土提供了埋藏的宝藏

ivory – n. a hard white substance that forms the tusks of elephants and other animals

well-preserved – adj. kept in good condition over a long period of time

evolutionary – adj. related to the theory that the differences between modern plants and animals are because of changes that happened by a natural process occurring over very long time

controversy – n. argument that involves many people who strongly disagree about something : strong disagreement about something among a large group of people

clone – v. to make an exact copy of a person, plant or animal

extinct – adj. no longer existing or living

hooves – n. plural, the hard coverings on the foot of an animal

nostril – n. one of two openings of the nose

sample – n. a small amount of something that gives you information about the thing it was taken from

specimen – n. a small amount or piece of something that can be tested or examined