英语词汇“challenging signal”的读音、翻译、释义、用法及例句-啃外文网

词汇	challenging signal
释义	见:signal: challenging signal
随便看	food action scale food additives food aerosols food alcohol Food and Drug A- food bacteriology food bar food-borne food-borne illness food-borne intoxication food can food can varnish food chain food chain concentration food chain cycle food chain transport food chemistry food coefficient food composition food composition table food conditioned stimulus food connection food container food contaminant food contamination

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