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宇航员都是勇敢的人。除了他们,还有谁愿意在工作中感受骨骼日渐衰弱,整日恶心,还得连续很多天穿同一件内衣呢?对人类来说,从事空间科学可不是愉快的事。
Astronauts are brave people. In addition to them, who else would like to experience the bones becoming weaker and weaker at work, and having to wear the same piece of underwear for many days in a row? It is not a pleasure for mankind to engage in space science.