0 the planet third in order of distance from the sun, between Venus and Mars; the world on which we live -- 地球；世界
1 the land surface of the world rather than the sky or sea -- 陸地，地面
2 a wire that makes a connection between a piece of electrical equipment and the ground, so the user is protected from feeling an electric shock if the equipment develops a fault -- 地線
3 a hole in the ground where an animal such as a fox lives -- （狐狸等動物的）洞穴
4 to put an earth (= wire) between a piece of electrical equipment and the ground -- 把（電線）接地
It was Ptolemy who propounded the theory that the earth was at the centre of the universe.
As every schoolboy knows, the earth revolves around the sun.
Meteorites often burn up in the atmosphere before they reach the Earth.
Their hoofs threw up clods of earth as they galloped across the field.
There was a large mound of earth in the middle of the field.
