毋庸置疑，中国的航空航天事业在过去的几十年里已经取得了辉煌的成就。
It is beyond doubt that China has made brilliant achievements in aviation and space industry in the past decades.
无庸置疑，中国的航空航天工业在过去的四十年中已取得了辉煌的成就。
It is beyond doubt that China has made brilliant achievements in aviation and space industry in the last forty years.
勿庸置疑，中国的经济在过去的几年里已经取得了辉煌的成就。
It is beyond doubt that China has made brilliant achievements in economy in the last few years.
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