... yellow colour index 黄色指数 Yerkes system 叶凯士系统 yoke mounting 轭式装置 ...
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Having seen the situation, a wealthy American businessman, Charles Yerkes, tried to improve the system by buying many of the different lines and setting up the Underground Group.
看到这种情况,美国富商查尔斯。耶基斯买下许多条不同的线路并成立了地铁集团,以试图改进当时的铁路运营系统。
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