Key words ellipse, circular cone, projection.
关键词椭圆，圆锥，投影。
As long as no key is pressed, the scanning goes around in a circular manner.
只要没有按下键，扫描就循环地进行。
The key for the development of circular economy is to construct a price system in the resource environment.
发展循环经济的关键在于构建资源环境价格制度。
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