Soviets started to explore liquid rocket engine technologies as early as 1930s.
苏联早在30年代就开始了液体火箭发动机的研制工作。
This paper analyzes the existing search engine technologies in common use, and points out their limitations.
分析了现有的通用搜索引擎技术，并指出了其局限性。
This paper analyzes the existing search engine technologies in common use, and points out their limitations.
分析了现有的通用搜索引擎技术，并指出了其局限性。
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