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今天我们要学的词是roll out。Roll out, 正式推出产品或服务。 "Big banks such as Bank of America and Citi Bank rolled out extra debit card fees recently," 美国银行和花旗银行等大银行最近相继推出额外的借记卡收费。 "Apple will roll out the latest model of iPhone to many more countries later this year," 苹果今年晚些时候将在更多国家推出最新型的iPhone。为了和iPhone竞争，美国电话公司T-Mobile加紧推出新型智能手机。 "T-Mobile is rolling out multiple Android smartphones and tablet models in order to secure its market share," T-Mobile将正式推出多款智能手机和平板机，以巩固市场份额。好的，今天我们学习的词是roll out...
