慢速英语:科学家：早期人类并不像人们想象的那么简单

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advanced – adj. being far along in progress or development

artifact – n. a simple object such as a tool or weapon that was made by people in the past

journal – n. a publication dealing mainly with issues of current interest

pigment – n. a natural substance that gives coloring to animals and plants; a substance that gives color to something else

fossil – n. remains of an ancient organism that has been protected in Earth's surface

paleoanthropologist – n. the study of anthropology that deals with fossils

projectile – n. something that is thrown as a weapon

symbolic – adj. expressing or representing an idea or quality without using words