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natural source
natural spirits
natural spline
natural spline function
natural splitting
natural standard
natural starter
natural steam
natural steam power generation
natural steam power station
natural steel
natural step length
natural strain
natural stress
natural substrates
natural subtype
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natural sweetener
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natural synoptic region
natural synoptic season
natural synthesis
natural system
natural talent science
natural tangent
natural taper
natural target
natural texture
natural theology

 natural source
天然(污染)源


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