柯林斯词典mother-of-pearl (also mother of pearl) 1. N-UNCOUNT Mother-of-pearl is the shiny layer on the inside of some shells. It is used to make buttons or to decorate things. 珠母层 返回 mother-of-pearl剑桥词典a smooth , hard substance forming a layer inside the shells of some sea creatures . It is white but also seems to shine with different colours , and is used to make buttons and for decoration . 珠母层，珍珠母 同义词nacre 返回 mother-of-pearl