early railroad 中文意思是什麼
early railroad
解釋
早期鐵路-
Stoplights are red, yellow, and green, because traffic officials, early on copied the code system railroad engineers devised for track systems controlling the trains
交通信號燈採用紅、黃、綠三種顏色,是因為早期的交通指揮官模仿鐵路工程師所設計的用於鐵道系統控制火車的編碼系統。 -
Most of today ' s chinese americans are the descendants of some of the early miners and railroad workers
現在的美籍華人大多數都是一些早期礦工和鐵路工人的後裔。 -
Despite the clear - cut technological advantages, the railroad didn ' t become the primary means of transportation for nearly 20 years after the first pioneering american railroads were introduced in the early 1830s
盡管鐵路運輸在技術上有明顯優勢,但是美國的鐵路在19世紀30年代早期閃亮登場后的近20年中卻沒有成為首要的交通運輸手段。
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