2006年4月20日,家住黑龙江省牡丹江市爱民区社区服务中心内的72岁老人刘俊芝真是太高兴了。这天下午,她到人们扎堆晒太阳的地方,向十几位街坊邻居说着自己的高兴事儿:“我爱上街,还经常去活动中心和花园,过去都是步行,现在拿着这公交卡就可以免费乘公交车了,太方便了。等你们到 On April 20, 2006, Liu Junzhi, a 72-year-old man who lives in the Aimin Community Service Center in Mudanjiang City, Heilongjiang Province, was so happy. On the afternoon of the same day, she talked to her dozens of neighbors as she sunk up to the sun. "I fell in love with the streets. I often go to events centers and gardens. I used to walk and now hold Bus card can be free to take the bus, so convenient. Wait for you