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DEFINITIVE EXAMPLES 权威例句〔trophic level〕A group of organisms that occupy the same position in a food chain.营养层次,营养级:在食物链中居于同一地位的一群生物美国传统
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nitrogen equivalent
nitrogen family
nitrogen fertilizer
nitrogen fixation
nitrogen fixation activity
nitrogen fixation process
nitrogen gas thermometre
nitrogen group
nitrogen group
nitrogen hardening
nitrogen heterocyclic ring
nitrogen lag
nitrogen lime
nitrogen metabolism
nitrogen molecular laser
nitrogen monoxide
nitrogen mustard
nitrogen mustard
nitrogen mustards
nitrogen oxide
nitrogen oxide
nitrogen oxychloride
nitrogen partition
nitrogen partition tests
nitrogen pentoxide
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