【TED】克里斯托夫-尼曼：你精通這門語言（甚至不知道）（你精通這門語言（甚至不知道）|克里斯托夫-尼曼）。 (【TED】Christoph Niemann: You are fluent in this language (and don't even know it) (You are fluent in this language (and don't even know it)