translation.en: In 2009, Zipcar took 250 participants from across 13 cities -- and they're all self-confessed car addicts and car-sharing rookies -- and got them to surrender their keys for a month.
translation.zh: 在2009年， Zipcar让 遍及13个城市的250个参与者， 他们都自称是汽车爱好者， 加入到汽车分享总动员活动， 并让他们交出汽车钥匙一个月。