In other words, what--or the woodwinds-- what family of instruments is playing here and is Tchaikovsky using a motive or is he using a theme at the very beginning of this concerto?

或者是木管乐器,换句话说,这里演奏的是什么乐器,还有柴可夫斯基在这首协奏曲的开始部分,运用了动机还是主题

耶鲁公开课 - 聆听音乐课程节选