“秋天到了,天气凉了,一行大雁往南飞,一会儿排成‘人’字形,一会儿排成‘一’字形”……你可曾记得小学语文课堂上那富有磁性的录音?不过,对于大雁,最直接的疑问必然是,大雁南飞为啥要排成“人”字形或者“一”字形?在现有的大雁人字形编队说法中,“节省体力”的解释流传最广。1914年,德国的空气动力学家卡尔·魏斯伯格经过简单计算后首次提出大雁人字形飞行可以节省能量这一假说。他认为,大雁翅膀扇动会引发尾流的涡旋,而涡旋的外侧正好是向上的气流。如果相邻的大雁刚好处在上升气旋里,那么他们的飞行就会大大节省体力。 “Autumn arrived, the weather was cold, a line of wild geese flying south, a line of ’people’ shape for a while, and a line of ’one’ shape for a while.’... Do you remember the magnetic recording in the primary school language class? However, For the wild geese, the most direct question must be that the geese and Nanfei are to be arranged as a ”person“ or a ”one“ shape. In the existing Dayan herringbone formation statement, ”saving physical strength" Interpretation is the most widespread. In 1914, the German aerodynamicist Karl Weissberg proposed for the first time that the fly geese can save energy. He believes that the fan wings of wild geese will cause wake vortices, and the outside of the vortex is just upward airflow. If the adjacent geese just benefit from rising cyclones, their flight will save a lot of energy.