1. 地球（指宇宙組成部分時用Earth，指人類居住的星球時用the Earth）
    Earth or the Earth is the planet on which we live. People usually say Earth when they are referring to the planet as part of the universe, and the Earth when they are talking about the planet as the place where we live.

    e.g. The space shuttle Atlantis returned safely to earth today. “
           亞特蘭蒂斯”號航天飛機今天安全返回地球。
    e.g. ...a fault in the Earth's crust.
           地殼斷層

2. 陸地;地面
    The earth is the land surface on which we live and move about.

    e.g. The earth shook and the walls of neighbouring houses fell around them.
           地面搖晃，周圍房屋的墻體在他們身邊倒塌。

3. 泥土;土壤;土地
    Earth is the substance on the land surface of the earth, for example clay or sand, in which plants grow.

    e.g. The road winds for miles through parched earth, scrub and cactus...
           公路蜿蜒數(shù)英里，穿過炙烤的大地、灌木叢和仙人掌。
    e.g. They will revert to tilling the earth in an old-fashioned way.
           他們將回歸到用老方法耕地。

4. （狐等的）洞穴
    An earth is a hole in the ground in which an animal such as a fox lives.

5. （接）地線
    The earth in an electric plug or piece of electrical equipment is the wire through which electricity can pass into the ground, which makes the equipment safe if something goes wrong with it.

earth

    e.g. The earth wire was not connected.
           地線沒有接上。

6. see also: down-to-earth

7. （用于以how, why, what 或 where 開始的問句，表示強調(diào)，通常表示問題沒有答案或很難回答）究竟，到底
    On earth is used for emphasis in questions that begin with words such as 'how', 'why', 'what', or 'where'. It is often used to suggest that there is no obvious or easy answer to the question being asked.

    e.g. How on earth did that happen?...
           那件事到底怎么發(fā)生的？
    e.g. What on earth had Luke done?...
           盧克究竟做了什么？

8. （用于否定名詞短語后表強調(diào)）根本，完全
    On earth is used for emphasis after some negative noun groups, for example 'no reason'.

earth的反義詞

    e.g. There was no reason on earth why she couldn't have moved in with us...
           她沒能搬過來和我們同住，這根本就說不通。
    e.g. There is no feeling on earth like winning for the first time.
           初嘗勝利滋味的感覺真是無可比擬。

9. (用于包含形容詞最高級的名詞短語后表示強調(diào))世界上，人世間
      On earth is used for emphasis after a noun group that contains a superlative adjective.

      e.g. He wanted to be the fastest man on earth.
             他想成為世界上跑得最快的人。
      e.g. ...the site of the worst ecological disaster on earth.
             世界上最嚴(yán)重的生態(tài)災(zāi)難發(fā)生地

10. （激動之后）恢復(fù)正常生活，回到現(xiàn)實
      If you come down to earth or back to earth, you have to face the reality of everyday life after a period of great excitement.

      e.g. When he came down to earth after his win he admitted: 'It was an amazing feeling'...
             從勝利的喜悅中平復(fù)后，他承認：“當(dāng)時感覺棒極了?！?br />      e.g. I was shocked, brought down to earth by this revelation.
             真相的披露讓我深感震驚，我被帶回了現(xiàn)實。

11. （經(jīng)過長時間的尋找后）終于找到
      If you run someone or something to earth, you find them after searching for them for a long time.

      e.g. She ran him to earth in the pub at five to one.
             1點差5分的時候，她終于在酒館里找到了他。

12. 價格不菲/斥巨資
      If you say that something cost the earth or that you paid the earth for it, you are emphasizing that it cost a very large amount of money.

      e.g. It must have cost the earth.
             這肯定花了很多錢。

13. hell on earth -> see hell
      to move heaven and earth -> see heaven
      salt of the earth -> see salt