electric trolley

基本解释

Smart electric trolley, the source and circuit diagrams, some functions have been achieved, other functions need perfect!
智能電動小車，源程序和電路圖，部分功能已經實現，其他的功能還需要完善！
Many foreign cities in developing electric trolley buses and trams, as they are beneficial to the environment.
國外很多城市都在發展無軌電車和有軌電車，因爲它們對環境有利。
Beijing is also vigorously developing electric trolley buses in recent years, Beijing has grown from 500 the number of trolley bus …
北京也在大力發展無軌電車，近年來，北京無軌電車數量已經從500 …