21. | The planets of our solar system are Mercury, Venus, Earth , Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. |
| 我们太阳系的行星是水星, 金星, 地球, 火星, 木星, 土星, 天王星, 海王星, 冥王星。
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22. | No power on earth could force me to do it. |
| 谁也不能强迫我做这事。
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23. | Politicians promise the earth before an election, but things are different once they are in power. |
| 政治家在选举前空口许愿,一旦上台就根本不是那么回事了。
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24. | The moon circles the earth every 28 days. |
| 月亮每28天绕地球一圈。
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25. | The earth takes a year to make a circuit of the sun. |
| 地球绕太阳一周需要一年时间。
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26. | The earth had been churned up by the wheels of the tractor. |
| 拖拉机轮子把泥土掀了起来。
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27. | The circumference of the earth is almost 25000 miles/The earth is almost 25000 miles in circumference. |
| 地球的圆周长约为25000。
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28. | Mission control ordered the spacecraft to return to earth . |
| 指挥部命令宇宙飞船返回地球。
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29. | Former students of this school are now working in the four corners of the earth . |
| 该校的校友现在世界各地工作。
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30. | The earth has a core and a mantle around it. |
| 地球的中心是地核,地核的周围是地幔。
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