electric trolley

基本解释

Smart electric trolley, the source and circuit diagrams, some functions have been achieved, other functions need perfect!
智能电动小车，源程序和电路图，部分功能已经实现，其他的功能还需要完善！
Many foreign cities in developing electric trolley buses and trams, as they are beneficial to the environment.
国外很多城市都在发展无轨电车和有轨电车，因为它们对环境有利。
Beijing is also vigorously developing electric trolley buses in recent years, Beijing has grown from 500 the number of trolley bus …
北京也在大力发展无轨电车，近年来，北京无轨电车数量已经从500 …