Howdopeoplefindtheirways?Atfirst,peoplediditbylookingat...
问题详情：Howdopeoplefindtheirways?Atfirst,peoplediditbylookingatthesun,themoonandstars.Later,westartedtousethecompass（指南针）.Today,therearenavigationsatellitesystems.Anavigationsatellitesystemusesgroups...