Ăn trai ngọc
Loài trai ngọc là động vật thân mềm sống dưới nước, được bao bọc bởi hai lớp vỏ cứng. Khi một dị vật nào đó lọt vào cơ thể, trai sẽ tiết ra một chất bọc lấy dị vật đó và khối chất bọc này cứ lớn dần thành viên ngọc trai, hay còn gọi là trân châu
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