你听过这样一个故事吗?从前,有位渔夫出海捕鱼,从海里捞到一颗大珍珠。这颗珍珠晶莹圆润,渔夫爱不释手。但美中不足的是,珍珠上面有个小黑点。渔夫心想,如果能把小黑点去掉,珍珠完美无瑕,就会成为无价之宝。于是,他就开始耐心地剥剔黑点。可是去掉一层,黑点依然存在;再去掉一层 Have you ever heard of such a story? Once upon a time, a fisherman had taken to sea fishing and had a large pearl from the sea. This pearl crystal mellow, fisherman put it down. But the fly in the ointment is that there is a small black pearl above. Fisherman thought, if you can remove the black spots, pearls flawless, it will become priceless treasure. So he began to peel black spots patiently. But remove the layer, black spots still exist; then remove the layer