A new C_(21) steroid(compound A) has been isolated from Marsdenia tenacissima(Roxb.) Wight et Arn. (Asclepiadaceae).是什么意思_A new C_(21) steroid(compound A) has been isolated from Marsdenia tenacissima(Roxb.) Wight et Arn. (Asclepiadaceae).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句