北京于昨日告别了纸质地铁客票，开始启用电子客票。
Beijing said goodbye to paper subway tickets yesterday. They were replaced with electronic ones.
单位：北京交通大学机械与电子控制工程学院。
SETTING: School of Mechanical and Electronic Engineering, Beijing Jiaotong University.
北京中加学校是北京第一所每个教室都安装电子白板系统的学校。
It is the first school in Beijing to incorporate the Smartboard system in each classroom.
北京中加学校是北京第一所每个教室都安装电子白板系统的学校。
It is the first school in Beijing to incorporate the Smartboard system in each classroom.
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