【beforeuntil的转换他是对抗菌物质进行了长达九年的实验才有所发现的.两种翻法：1,Heexperimentedwithantibacterialsubstancesaslongasnineyearsbeforehemadehisdiscovery.2,Hedidn'tmakehisdiscoveryuntilheexper】

　　beforeuntil的转换

　　他是对抗菌物质进行了长达九年的实验才有所发现的.两种翻法：1,Heexperimentedwithantibacterialsubstancesaslongasnineyearsbeforehemadehisdiscovery.2,Hedidn'tmakehisdiscoveryuntilheexperiedwithuntibacterialsubstancesaslongasnineyears.这两个句子都对吗个?第2个句子主句主语和从句主语相同是否可以写得更简略点,