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cross-contamination

noun
🔊/ˌkrɒs kənˌtæmɪˈneɪʃn/
🔊/ˌkrɔːs kənˌtæmɪˈneɪʃn/
[uncountable]
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  1. the process by which harmful bacteria spread from one substance to another（病菌的）交叉污染
    • Always cover raw food to prevent cross-contamination.始终盖好生食以防止交叉污染。