earthmann.地球人(即地球上的人；该词源于科幻小说)earthn.地球；泥土；世间earth's environment双波长earth dam with core心墙土坝earthmoving machine土方机械earth return system地回路方式,地回路制earth reinforcement加筋土Earth's rotary rate二元指标体系earth coverage area地面覆盖区earthworker's tools双束激光earth discontinuity地球间断面Earthing overvohage接地过电压