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China flagerica
cosa significa '' gas prensenti in tracce''? grazie gas presenti IN TRACCE

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It means that there are some gases in a very small amount. A trace (traccia) is a very small amount of something, almost too small to find. In this case we use the plural "tracce" instead of the singular "traccia". Ex. Ci sono tracce di piombo nell'acqua There are traces of lead in the water in italiano: significa che ci sono dei gas in piccola quantità, una quantità talmente piccola che è quasi difficile da rilevare.

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