中的to form不能换成forming
因为是先反应，后生成水。
目前共有8篇帖子。
Hydrogen reacts with oxygen, to form water.
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Speak, using a rubber band. 强调speak和using同时发生 |
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# JosephHeinrich @JosephHeinrich @nm199693 @nm199693Ⅱ @瑞奇 |
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= =
 
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2H2+O2=2H2O
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