他送給女友一枚鑲著藍(lán)寶石的訂婚戒指。He gave his girlfriend a sapphire engagement ring.現(xiàn)在讓我們考慮象鉆石和藍(lán)寶石這樣的晶體.Now let us consider crystals such as diamond or sapphire.現(xiàn)在讓我們考慮象金剛石和藍(lán)寶石這樣的晶體.Now let us consider crystals such as diamond or sopphi...