Marx initiated the theory of world history but it was Lenin who had completed the development of Marxist theory of world history from uniline logic to double line logic .

马克思首创了世界历史理论，但马克思世界历史理论从 单线逻辑向双线逻辑的发展却是由列宁完成的。

The manufacture of the automatic track switch will realize the bidirection - transportation with uniline so as to double the efficiency .

卡 轨 车自动道岔的研制将实现 单线轨道的双向同时运输，从而 提高 运效 近一倍。