请问Edgar Allan Poe的小说 The Fall of the House of Usher的象征意义?用英语回答

The Fungus-Ridden Mansion: Decline of the Usher family.
The Collapsing Mansion: Fall of the Usher family.
The “Vacant eye-like” Windows of the Mansion: (1) Hollow, cadaverous eyes of Roderick Usher; (2) Madeline Usher’s cataleptic gaze; (3) the vacuity of life in the Usher mansion.
The Tarn, a Small Lake Encircling the Mansion and Reflecting Its Image: (1) Madeline as the twin of Roderick, reflecting his image and personality; (2) theimage of reality which Roderick and the narrator perceive; though the water of the tarn reflects details exactly, the image is upside down, leaving open the possibility that Roderick and the narrator see a false reality; (3) the desire of the Ushers to isolate themselves from the outside world.
The Bridge Over the Tarn: The narrator as Roderick Usher’s only link to the outside world.
The name Usher: An usher is a doorkeeper. In this sense, Roderick Usher opens the door to a frightening world for the narrator.
The Storm: The turbulent emotions experienced by the characters.