Chris Williams is a NASA astronautastronaut/ˈæstrənɔːt/L1宇航员a person who travels to space from the United States. He lived on the International Space StationstationL1配备有特殊设备和人员的设施，用于特定目的a facility equipped with special equipment and personnel for a particular purpose (ISS) for many months. One day, there was a big air leakleak/liːk/L1泄漏when air or liquid comes out where it should not on the station. Two Russian astronauts had to fix the leak outside.
Chris and his crew put on their spacesuitsspacesuits/ˈspeɪssuːts/L1太空服special clothes that keep astronauts safe in space and waited in a Dragon spacecraft. Chris said it was not a good feeling because he was worriedworried/ˈwʌrid/L1担心的feeling scared or upset because something bad may happen about his friends. He knew what to do because of his trainingtraining/ˈtreɪnɪŋ/L1训练learning how to do something. The alert lasted for two hours, and then everyone was safe. Chris returned to Earth after 241 days in space. He traveled 102 million miles in space around the Earth.
