VOA慢速英语:Scientists Aim to Freeze DNA Before Creatures Die Off

classify– v.  to organize or arrange (people or things) into groups based on ways that they are alike

species – n. a group of animals or plants that are similar

adjacent – adj. close or near

specimen – n. something collected (such as an animal or plant) collected as an example of a particular kind of thing

biorepository - n. a place that collects, catalogs and stores samples of materials