birthstone
柯林斯词典
1. N a precious or semiprecious stone associated with a month or sign of the zodiac and thought to bring luck if worn by a person born in that month or under that sign 诞生石
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1. N a precious or semiprecious stone associated with a month or sign of the zodiac and thought to bring luck if worn by a person born in that month or under that sign 诞生石