美国国家航空航天局的研究一再表明，活的、绿色以及开花的植物，能够清除建筑物内空气中多种有害化学物质。
NASA research has consistently shown that living, green and flowering plants can remove several toxic chemicals from the air in building interiors.
美洲的一种被广泛种植的、结一次果的植物，高茎上长着稍带绿色的白花；仅仅在十年或二十年后开花，之后死去。
Widely cultivated american monocarp ic plant with greenish-white flowers on a tall stalk; blooms only after ten to twenty years and then dies.
美洲的一种被广泛种植的、结一次果的植物，高茎上长着稍带绿色的白花；仅仅在十年或二十年后开花，之后死去。
Widely cultivated American monocarpic plant with greenish-white flowers on a tall stalk; blooms only after ten to twenty years and then dies.
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