如果发现号在周日发射升空，此次飞行将持续13天，其主要任务是完成三次太空行走，其中的第一次行走将是安装新的太阳能电池板。
If Discovery blasts off Sunday, the mission will last 13 days and feature three spacewalks, the first of which will be to install the new solar wings.
发现号的最后11天的任务中包括两次太空行走进行维护和部件安装工作。
Two space walks for maintenance work and component installation are scheduled during the 11-day mission, Discovery's last.
如果一切顺利，三名“太空人”将于周四开始一段为期三天的太空之旅，其中一项任务是该国首次太空行走。
If all goes well, three "taikonauts" will embark Thursday on a three-day Earth-orbit mission, which includes the country's first spacewalk.
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