'Phosphorus,' I said,' That is why the hound appears to burn in the
dark. Stapleton put phosphorous paint on the hound in the hut beside the house.' 去书内
Through the twists and turns of the plot and the images of typical
characters, the author reveals some status quo of social life, and
expresses the attitude of praising, criticizing and calling people's
attention to it, thus expressing the theme of the novel.