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关注：1
2013-05-23 12:21
求翻译：向上的力与向下的力相等，所以气球就保持在这一高度是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
向上的力与向下的力相等，所以气球就保持在这一高度
问题补充： |
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2013-05-23 12:21:38
Upward force and downward force equal, so the balloon is kept in this highly
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2013-05-23 12:23:18
force upward and downward force to maintain equal, so that balloons in this highly
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2013-05-23 12:24:58
The upward strength and the downward strength are equal, therefore the balloon maintains at this highly
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2013-05-23 12:26:38
Up and down are equal, so that the balloon stays at the height of
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2013-05-23 12:28:18
Up and down are equal, so that the balloon stays at the height of
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