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。