名词
中文翻译：Unknown
同义词：
['astronaut', 'cosmonaut', 'space explorer']
例句：
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1. The astronaut was the first to land on the moon.
这位宇航员是第一个登陆月球的人。
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2. The cosmonaut is known for his bravery during the spacewalk.
这位宇航员因其在太空行走中的勇敢而闻名。
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3. The space explorer has been studying the planet Mars for years.
这位太空探险家已经研究火星多年了。