据说,在过去曾经发生过这样一件事:一商家在荷兰向当地渔民购进5000吨青鱼,装上船从荷兰运往靠近赤道的索马里首都摩加迪沙(图1).到了那里,用托盘式弹簧秤一称,青鱼竟一下少了30多吨.奇怪,鱼到哪里去了呢?被偷是不可能的,因为 It has been said that in the past there has been one such thing: a merchant bought 5,000 tons of herring from local fishermen in the Netherlands and loaded it on a ship from the Netherlands to the Somali capital Mogadishu near the equator (Fig. 1). There he used a tray. The balance of the spring scales said that the herring actually lost about 30 tons. It is strange, where did the fish go? It was impossible to be stolen because