S0: oooo ool S1:(Sunny, Warm, Normal, Strong, Warm, Same>j S2:<<Sunny, Warm, ? Strong, Warm, Same>) GO.GlG2 <??,?,?,?,?>} 训练样例: 1. <Sunny, Warm, Normal, Strong, Warm, Same>, EnjoySport-=yes 2. <Sunny, Warm, High, Strong, Warm, Same>, EnjoySport=yesS0: {< , , , >} ,       S1: {<Sunny,Warm,Normal,Strong,Warm,Same>} S2: {<Sunny,Warm,?,Strong,Warm,Same>} G0,G1,G2: {<?,?,?,?,?,?>} 训练样例： 1. <Sunny,Warm,Normal,Strong,Warm,Same>, EnjoySport=yes 2. <Sunny,Warm,High,Strong,Warm,Same>, EnjoySport=yes