解释 1.向上隆起的半球体。如：那一段路略呈穹形。
misc. quaquaversal
圆形平面或穹形平顶存在着明显的声学缺陷，这种现象在半球形房间中尤为严重。
Halls with circular plan or domed ceiling are apt to significant acoustic defects; and, it is even worse in hemi-spherical halls.
最独特的特点是圆屋顶，要让圆屋顶安置于方形基础上，可利用两种方式：内角拱(方形基础每个角落的拱门变为八角形)或穹隅。
To allow a dome to rest above a square base, either of two devices was used: the squinch (an arch in each of the corners of a square base that transforms it into an octagon) or the pendentive.
应用推荐