Small lumps of sand filled the water, some looking polished like a millstone, some frilled at the sides. What all had in common was the small hole at their center, with stepped edges.
海中有一片片薄薄小小的沙塊，有的表面像磨石子般光滑，有的邊緣似滾著花邊，唯一的共同點是中間都有個小圓洞，洞緣呈階梯狀。