【材料】一只珠母贝体内钻进了一颗小沙粒,它虽然痛苦难挨,却无法摆脱这突遭的不幸,于是分泌出一种液体把沙粒包裹起来、养育起来。随着时间的推移,珠母贝渐渐老了,它被海水带到沙滩上而且一过就是多年。一天,沙滩上出现了旅游团队,一名来自山区的小朋友发现这只珠母 【Material】 A small sand grain has been drilled into a pearl shell. Although it is hard to get rid of, it cannot escape this sudden misfortune. It secretes a liquid to wrap sand and raise it. As time goes on, the mother of pearl grows older. It is carried by the sea to the beach and it is years away. One day, a tourist team appeared on the beach. A child from the mountains discovered this pearl mother.