慢速英语:在墨西哥发现的工具表明人类更早到达北美

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flake(s) – n. a small, thin piece of something

blade(s) – n. the flat sharp part of a weapon or tool that is used for cutting

spear – n. a weapon that has a long straight handle and a sharp point

archeologist – n. a person who studies past human life and activities by studying the bones and tools of ancient people

diverse – adj. made up of people or things that are different from each other

anthropology – n. the study of human races, origins, societies, and cultures

extinction(s) – n. the state or situation that results when something, such as a plant or animal species, has died out completely