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关注：1
2013-05-23 12:21
求翻译：直到19世纪人们才认识到热是能量的一种形式。是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
直到19世纪人们才认识到热是能量的一种形式。
问题补充： |
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2013-05-23 12:21:38
Until the 19th century, people started to realize heat is a form of energy.
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2013-05-23 12:23:18
It was only in the 19th century people came to know that heat is a form of energy.
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2013-05-23 12:24:58
Until the 19th century people only then realized to hot is the energy one form.
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2013-05-23 12:26:38
Until the 19th century it was recognized that heat is a form of energy.
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2013-05-23 12:28:18
Until the 19th century people only then realized to hot is the energy one form.
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