a small round object , usually white , that forms around a grain of sand inside the shell of especially an oyster (= a sea animal with a large flat shell ) which is very valuable and is used to make jewellery
发音
例句
1. He bought his girlfriend a pearl necklace. 他给他女朋友买了一条珍珠项链。 2. The crane and the mussel fight to death. 鹬蚌相争。