Added Wood Arch building part.

增加木拱建筑。

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A bracket of stone, wood, brick, or other building material, projecting from the face of a wall and generally used to support a cornice or an arch.

托臂，翅托从墙面上凸出，常用于支撑檐口或拱形物的一种石、木、砖或其他建筑材料制成的建筑部件。

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The crawl space beyond had a floor of unpainted, unvarnished wood, and narrow walls of brick. The three-foot ceiling was curved in an arch. It looked like a chimney lying on its side.

另一面的管道地板是没有漆过的木板，两边是窄窄的砖墙。三尺宽的天花板弯曲成拱形。看上去像一个横放着的烟囱。

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