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Ta的回复 :188*****138: Assets/Speech/SpeechDemo.cs(24,37): error CS7069: Reference to type `System.ComponentModel.INotifyPropertyChanging' claims it is defined assembly `System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089', but it could not be found 这个错 回复188*****138:C# 的Api Level请不要使用Subset