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關(guān)注：1
2013-05-23 12:21
求翻譯：They help the astronauts.On the Earth,they are very heavy but in space they are much lighter.是什么意思？ 待解決
 懸賞分：1
- 離問(wèn)題結(jié)束還有
They help the astronauts.On the Earth,they are very heavy but in space they are much lighter.
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