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在苏联和美国研制螺旋液压井底发动机的工作引起很大的技术兴趣。最近，在苏联的刊物上详细报导了苏联螺旋发动机的结构及试验的首批结果。
The development of spiral hydraulic bottom-hole engines in the Soviet Union and the United States has drawn great technical interest. Recently, the Soviet Union published a detailed report on the structure of the Soviet spiral engine and the first results of the test.