That's important, he says, because for long-distance space flights in the future, NASA proposes growing plants on board for food, to purify water and to help filter carbon dioxide out of the air.
(That's important; says; he) Context(That 's important says,List([0, 25))):(That; 's; important) (NASA; proposes; growing plants on board for food) Context(NASA proposes,List([82, 95))):(NASA; proposes growing plants on board for food to purify; water)
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