字幕列表 影片播放 列印英文字幕 way. Welcome to the voice of America's news words. This'll news. Word is from the Crossrail Project, a train tunnel now being built in London. England. Artifact, the underground project to connect Heathrow Airport to the financial district, has uncovered more than 10,000 artifacts. One special artifact is a bronze medallion from the year 245 a. D. An artifact is a simple object, made and used by people in the past in science and artifact is a substance or structure formed by humans, not nature.