Perhaps the sea's definition of a shell is the pearl.
也许，大海给贝壳的定义是珍珠。
youdao
Freshwater pearl jewelry, shell, water beads, welcome to wholesale!
淡水珍珠饰品，贝壳，滴水珠，欢迎批发！
The shell used the little sand to make a pearl.
河蚌把这颗沙粒变成了一粒珍珠。
Pearl shell button;
珍珠贝壳钮扣；
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