名词短语
中文翻译：宇航员医疗认证
同义词：
['astronaut medical clearance', 'astronaut medical certificate']
例句：
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1. Theastronaut must undergo rigorous medical tests before boarding the spacecraft.
这名宇航员在登机前必须接受严格的体检。
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2.Before their mission, astronauts must obtain a medical certification to ensure they are fit for space travel.
在执行任务之前，宇航员必须获得医疗认证，以确保他们适合太空旅行。
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3. Astronauts must have a valid medical certification to participate in international space exploration.
宇航员必须持有有效的医疗认证才能参与国际空间探索。