1 . 二十世纪七十年代.美国人发明了照相机和手机. .Americans invented digital cameras and cellphones. 题目和参考答案——青夏教育精英家教网—

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1 . 二十世纪七十年代，美国人发明了照相机和手机。

，Americans invented digital cameras and cellphones.

1. In the 1970s

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