The scientist made the great invention when he was over seventy.改句意相同The scientist made the great invention ______ his ________.
问题描述：
The scientist made the great invention when he was over seventy.
改句意相同
The scientist made the great invention ______ his ________.
答
The scientist made the great invention [in] his [seventies].在他70多岁时
答
in (his) seventies
答
in seventies