One day you'll walk out 有一天你会离开
It was one thing to talk about leaving; it was another to physically walk out the door.
说要离开是一回事；真正走出门又是另一回事。
One day while on a walk, he realized that his shoes were starting to wear out.
一天，在散步时，他发现他的鞋子开始磨损了。
Space agencies try to work out all eventualities and possible needs, but one unexpected consequence of space travel was discovered during a space walk by astronaut Dan Barry.
航天单位试图为所有不测事件和可能的需求做好准备，但是在宇航员丹·巴里的太空行走中发现了一个意料之外的结果。
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