NASA最初的两架航天飞机，“哥伦比亚号”和“挑战者号”，比“发现号”更老，但均毁于航天灾难。

NASA's first two shuttles, Columbia and Challenger, were older than Discovery, but both were lost in spaceflight tragedies.

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本周二，“发现”号航天飞机的七位机组人员终于返回了地球，这是自2003年“哥伦比亚”号灾难事件后的首次航天飞行。

The seven-person crew returned to Earth on Tuesday after being the first to take a space shuttle into orbit since the Columbia disaster of 2003.

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