A seat is mounted on a platform which is surrounded by an endless circular projection-tunnel.
一个座椅被包装在投影幕形成的环里面组成了一个旋转平台。
The experimental results show that the technology of nut circular projection welding is superior to that of arc welding.
试验结果表明，螺母环形凸焊工艺优于电弧焊工艺。
Between each pair of staggered horizontal circular steel plains, the curving, conical projection screens are installed.
在每两个摇摆的水平圆形钢平面之间，安装着曲面的圆锥形投影屏幕。
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