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A technique for Marine seismic acquisition around salt domes or other circular features in which the acquisition vessel travels in a spiral path above the feature.
海上环绕盐丘或其它环状物体进行地震数据采集时使用的一种技术，采集船只在环状物体上方以螺旋形路径航行。
Mainly feature: use induction motor so that the handy circular saw come true table circular saw's function.
主要特征：由于采用感应电机，使手持式圆锯真正实现台式圆锯的性能。
The protean set, meanwhile, will feature giant chandeliers, a circular dias that juts out into the audience and 20 moving screens that will coalesce at certain points to form a single image.
与此同时，能千变万化的舞台场景将出现巨大的吊灯，朝观众席延生的圆形舞台，20个移动的电影屏幕将在特定的点上结合形成单一画面。
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