roll out 的意思是推出、出台，特别是首次推出。China is rolling out a nationwide initiative to help private business owners but some question whether it will be able to take the necessary steps. 中国正在全国范围内推出一项帮助私营企业主的计划，但有人质疑当局是否能够采取必要的措施。

 

U.S. electric-car maker Tesla is planning to produce two models in its Shanghai factory, with one of them slated to roll out next year. 美国电动汽车制造商特斯拉计划在其上海工厂生产两款车型，其中一款将于明年推出。