鸟是人类的朋友。它能够消灭危害农作物的害虫，五颜六色的羽毛，俏皮可爱的动作给我们带来了无尽的欢乐。对于有的人来说，每天早晨能伴着鸟儿欢快清脆的歌声中醒来，别提是多么幸福的一件事了。 Birds are friends of human beings. It can kill the pests that harm the crops, the colorful feathers, and the lovely and lovely movements that bring us endless joy. For some people, it is a happy thing to wake up with the birds' happy and crisp songs every morning. 但机场附近的鸟类却是民航人的心头大患。从人类从事飞行活动之初，鸟类就被认为是对飞行活动的一种威胁。飞机被鸟类撞击，轻则航空器表面结构受损，航班返航备降；重则发动机被摧毁造成几百万的经济损失：甚至机毁人亡，后果不堪设想。 But the birds in the vicinity of the airport are in the heart of the civil aviation. Birds are considered to be a threat to flight activities at the beginning of the flight of humans. The plane was bird strike, damaged light aircraft surface structure, the alternate flight to return; while the engine was destroyed by millions of economic losses and even the plane crash consequences be unbearable to contemplate. 统计，每年美国有超过1万次鸟击飞机的事件，其中最常见的危害是损伤发动机，这类损伤一年要造成航空业9.5亿美元的损失。同样，近几年我国运输类飞机因鸟击导致的事故征候占总事故征候的很大比例，是数量最多的事故征候类型之一。频繁且严重的鸟击事件使得鸟击事件得到重视，目前国际航空联合会已把鸟击升级为A类航空灾难。鸟击对于民航的打击是沉重的，因此鸟害防治显得尤为重要。 Statistics show that every year there are more than 10 thousand bird attacks in the US. The most common danger is the damage to the engine. These injuries cause 950 million dollars loss in aviation industry every year. Similarly, signs of accidents in recent years China's transport aircraft due to bird strike caused accounted for a large proportion of incidents, is one of the largest number of incident types. Frequent and serious bird strikes have made the bird strike pay attention, and the international aviation Federation has now upgraded the bird strike to a class a aviation disaster. Bird strike is a heavy blow for civil aviation, so bird pest control is particularly important. 区区小鸟为何会有如此大的威力？我们可以借助高中物理的动量守恒原理来解释：假设鸟的重量为0.225kg，鸟的飞行速度为150km/h,飞机的飞行速度取700km/h，鸟撞击飞机时间为1s，鸟撞击飞机后相对飞机静止。根据M(V初-V末)=F×t,公式，将上述数据带入可知，该鸟对飞机的作用力为1048N。我们再假设鸟与飞机的接触面积为18cm2 ，根据压强=力/接触面积可知，此时鸟对飞机的作用力就相当于一个重达1048kg的物体砸向飞机，（我们取该物体与飞机的接触面积为180平方厘米)。 Why does a little bird have such a great power? We can use the principle of momentum conservation in high school physics to explain: assuming that the bird's weight is 0.225kg, the speed of the bird is 150km/h, the speed of the airplane is 700km/h, the time when the bird hits the airplane is 1s, and the bird is still relative to the plane after hitting the airplane. According to M (at the end of V -V) =F x T, the formula shows that the bird's force to the aircraft is 1048N. We further assume that the contact area of the bird and the aircraft was 18cm2, according to the pressure = force / contact area shows that the birds of the aircraft force is equivalent to a proportion of 1048kg objects at the plane, (we take the object and the contact area of the aircraft is 180 square centimeters).