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We cultivate thre kinds of cherry: the sweet, the sour, and the flowering.
Sour cherries grow wild worldwide and were known to the Greeks and Romans.

When something is known to someone, what could that mean?
Here, Sour cherries are popular among them so they frequently eat them?
Or they just heard about sour cherries and might have tried some?

Thanks!
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mariottWe cultivate three kinds of cherry: the sweet, the sour, and the flowering.
Sour cherries grow wild worldwide and were known to the Greeks and Romans.

When something is known to someone, what could that mean?
Here, Sour cherries are popular among them so they frequently eat them?
Or they just heard about sour cherries and might have tried some?

Thanks!
It usually means that these fruits were mentioned in writings of the time. The Greeks and Romans conquered many lands, so even though the trees were not indigenous to Greece or Italy, they would have found them in their natural habitats. Perhaps they traded them. Cherries can be dried or made into preserves.
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Thanks! AlpheccaStars, It really helped!