眼球是身体中唯一接近空腔球体的视觉器官。
The roof of the natatorium of Chongqing adopts quadrangular pyramid with welding hollow sphere joints.重庆市游泳、跳水馆屋盖设计采用四角锥焊接空心球节点钢管网壳。
hollow sphere plastic pigment H-B is more fit for formulation of LWC than hollow sphere plastic pigment H-A.空心球塑料颜料h—B比空心球塑料颜料h—a更适合用于轻量涂布纸涂料配方中。