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noun | adjective
precontamination [ˌpriːkənˌtæmɪ'neɪʃn] n
space 初期污染
precontamination [ˌpriːkənˌtæmɪ'neɪʃn] adj.
gen. 沾污 〔污染〕前的; 初期沾污〔污染〕

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