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出典:Wiktionary
space exploration (countable かつ uncountable, 複数形 space explorations)
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宇宙旅行.
space beyond the earth's atmosphere
the vast frontiers of space science
宇宙時代.
the space age
the space known as the universe
relative to the earth, a portion of universal space called deep space
the thrills of space travel
the know‐how of space travel