We humans have been learning from the creatures and animals in nature. One of the most commonly used ultra-ranging and reversing radars is actually learning from bats. They can judge the objects around them by emitting ultrasonic waves and then returning waves. They can know whether the things around them are still or moving without looking, and they can also capture flying insects very accurately. It is admirable to solve your own food and clothing problem and not hit obstacles, which is better than using your eyes.
Now almost every family has a car, and parking and reversing has always been a long-standing problem, especially for novice drivers. The current reversing radar can help our driver friends judge the distance very well. In fact, this distance is also used. By sending out super-life, we begin to calculate the time, then multiply the time by the speed and divide it by 2 to get the final distance. The reason is simple, but it is still complicated to realize. We should be fault-tolerant, conduct multiple tests, and then filter out anomalies.
Although bats are ugly, they are very helpful to us. We not only learned a lot from them, but also helped us eat a lot of pests, which not only saved pesticides, but also avoided pesticide poisoning, so we should not hurt them or get in close contact with them, because bats have a lot of bacteria, so it is best not to let them enter our homes. At night, close the doors and windows this morning to prevent flying insects from coming in.