C2002 A Reasonable Guess

"It's like a pearl. "

Lee Feng's words made everyone look at her in surprise.

"What I mean is," Lee Feng considered her words. "Look, artificially raised pearl clams. If they want to produce pearls, they need to put a grain of sand into the clams and let it secrete some calcium carbonate mineral beads. That's why they form pearls. They look very similar to the iron jar in front of them