Assertion: pearl oyster | /r/CapableOf | cover grain of sand
Facets:
value: repeatedly
type: TEMPORAL
value: with mixture of calcium and protein
type: OTHER
Source sentences:
text: They repeatedly cover grain of sand with mixture of calcium and protein (substance called nacre) until prominent, white, yellow, rose or black-color pearl is created, usually 3 to 6 years later.
text: They repeatedly cover grain of sand with mixture of calcium and protein (substance called nacre) until prominent, white, yellow, rose or black-color pearl is created, usually 3 to 6 years later.