B1 [ S or U ] also Earth the planet third in order of distance from the sun, between Venus and Mars; the world on which we live地球;世界
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It was Ptolemy who propounded the theory that the earth was at the centre of the universe.
The satellite slowly rotates as it circles the earth.
As every schoolboy knows, the earth revolves around the sun.
Meteorites often burn up in the atmosphere before they reach the Earth.
Theories abound about how the earth began.
B2 [ S or U ] the land surface of the world rather than the sky or sea陆地,地面
B2 the usually brown, heavy and loose substance of which a large part of the surface of the ground is made, and in which plants can grow泥土,土壤
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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.
A large worm wriggled in the freshly dug earth.
In the spring you almost feel you can smell the earth.
I like to get my hands in the earth when I'm gardening.
[ C usually singular ] UK US ground 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地线
[ C ] a hole in the ground where an animal such as a fox lives(狐狸等动物的)洞穴
to put an earth (= wire) between a piece of electrical equipment and the ground把(电线)接地
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