英语作文 假如让你来发明一样东西,你想发明什么?为什么?它的用处是什么?

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英语作文 假如让你来发明一样东西,你想发明什么?为什么?它的用处是什么?

i wish i would invent a kind of machine which can help to deal with the rubbish.Because the environment has been badly polluted.it is difficult for us to breathe fresh air and drink clean water.if i c...