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  3. The distinctive architectural feature of the typical Broadway theater is the juxtaposition of two almost independent buildings f

The distinctive architectural feature of the typical Broadway theater is the juxtaposition of two almost independent buildings f

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问题     The distinctive architectural feature of the typical Broadway theater is the juxtaposition of two almost independent buildings facing and opening into one another through a proscenium arch. The audience sits in the auditorium structure and watches the actors perform in the stage house. 61) This separation is more than an aesthetic impression, because the building codes require that a physical barrier protect the audience from a fire starting on the stage. A fireproof wall, rather than a more partition separates the structures, and 62) this separation is completed by a fireproof curtain that is rigged to fall automatically and close the proscenium opening in case of fire. Automatic fire doors similarly close all other openings between the two structures. The codes keep such openings to a minimum.
    This separation came about in the 19th century in the United States as a result of theater fires. 63) It has produced a fundamental structural change from previous centuries without making much corresponding change in the appearance of the building. Most theaters of the 16th to 18th centuries were remodeled from banquet halls, tennis courts, and other rectangular halls and remained essentially a single structure with a thin partition for the proscenium wall.
    So far as the audience is concerned, a theater is primarily a place for entertainment. 64) Its great attraction is the opportunity it affords for vicarious experience. The audience approaches the theater with the expectation of some form of glamour, excitement, or emotional vividness. The architect and the decorator try to sustain and increase this excitement and anticipation as the spectator moves through the theater. 65) One of the familiar architectural devices for this effect is spaciousness of lobby, foyer, and auditorium. Color and ornamentation are other devices for the same purpose, as seen in almost all theaters built before the 20th century.
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答案在失火时，隔火帘会自动放下，把舞台前的通路遮蔽，从而达到隔离效果。
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