When astronauts venture outside of the International Space Station to go on spacewalks, the most important thing they have to do is focus.
원문출처 : https://www.cnn.com/2021/05/26/world/nasa-spacewalk-explainer-scn/index.html
원문출처 : https://www.cnn.com/2021/05/26/world/nasa-spacewalk-explainer-scn/index.html