A Russian hot air balloon flies over the golden crosses of the Orthodox church during the annual International Aerostati8月21日，在距俄罗斯首都莫斯科约60公里的德米特罗夫，一只代表俄罗斯参赛的热气球从一座东正教教堂的塔尖飞过。
Conventional aerostatic bearings have the problems of vibrations and motion inaccuracy due to the low stiffness.传统的静压气体径向轴承由于低刚度而存在着振动和运动精度不高的问题。