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BE oF grEAt usEFul

Inventions We knew there had been many inventions last century,for example,telephone,phonograph,airplane,computer and so on.What’s the most useful invention?I think the most usuful invention should be telephone.With invention o...

The horse is useful to man. 马对人类有用。 The whale is a mammal. 鲸鱼...the United Kingdom of Great Britain and Northern Ireland 大不列颠及北爱尔兰...

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