Although the upgrade was prompted by rail's popularity, its progress reveals some underlying problems too.
尽管铁路的名声对升级工程的推进，它的进程也暴露出其潜在的问题。
The announcement marks further progress in China's efforts to upgrade the quality of service offered by its blossoming airlines.
这一行动也标志着中国为改进航空公司服务质量而付出的努力取得了又一进步。
Though most people won't have the opportunity to see this impressive work in progress, we were able to ride along on a press tour Friday to see the upgrade in action.
虽然大多数人不会有机会看到这种令人印象深刻的工作正在进行中，我们可以凑凑热闹上周五的记者参观看到在行动升级。
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