sof·fit /ˈsɑfət/
下端背面,拱腹
Sof·fit n. Arch. The under side of the subordinate parts and members of buildings, such as staircases, entablatures, archways, cornices, or the like. See Illust. of Lintel.
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soffit
n : the underside of a part of a building (such as an arch or
overhang or beam etc.)