当宇航员在太空行走时，他们会使用安全绳以保持他们与飞船的距离。
When on a spacewalk, astronauts use safety tethers to stay close to their spacecraft.
此外，我们倾向于认为自己是友好的，但我们更喜欢与他人保持至少3英尺或一臂远的距离。
Moreover, we like to think of ourselves as friendly, yet we prefer to be at least 3 feet or an arm's length away from others.
参观期间佩戴口罩，与他人保持距离。
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