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Space is a dangerous place, not only because of meteors (流星) but also (1) rays from the sun and o...

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the Apollo mission was very successful  protection from space radiation is no easy job  astronauts will have deformed children of grandchildren  radiation is not a threat to well protection space explorers  
in order  out of order  in place  out of breath  
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the Apollo mission was very successful  protection from space radiation is not an easy job  astronauts will have deformed children or grandchildren  radiation is not a threat to well-protected space explorers  
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the Apollo mission was very successful  protection from space radiation is no easy job  astronauts will have deformed children of grandchildren  radiation is not a threat to well protection space explorers  

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