在我国北方的冬天,很多小朋友都爱在湖水、河水冻结的冰上滑冰、玩耍,掉进冰窟窿里的意外事故几乎每年都会发生。其原因不外乎结冰的表面厚薄不一,或因天气暖和、气候平均温度偏高,冰已开始解冻、变薄,一脚踩空而掉入冰窟窿中。在冰水中,最大的危险不在于会不会游泳,而是在数分 In winter in the north of our country, many children love ice skating, playing in the frozen water of the lake and accidents that fall into the ice hole almost every year. The reason is nothing more than frozen surface thickness varies, or because of the warm weather, the average high temperature of the climate, the ice has begun to thaw, thinning, kicked empty and fall into the ice hole. In ice water, the biggest danger is not that it will not swim, but in a few minutes