一道英语题按要求改写句子The scientist made the great invention when he was over seventy.(保持原句意思)

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一道英语题按要求改写句子
The scientist made the great invention when he was over seventy.(保持原句意思)

The scientist made the great invention in his seventies.

1The scientist made the great invention in his seventies.
2the great invention was made by the scintist when he was over seventy

一楼的翻译对的,不过第二句听起来有点勉强
1The scientist made the great invention in his seventies.
2the great invention was made by the scintist when he was over seventy

It was over seventy when the scientist made the great invention.
The scientist invented the object in his 70s.
The great invention was made by the scientist when he was over seventy.