The antenna of the radar is like the mouth of a bat, the radio waves emitted by the radar are like the ultrasonic waves of the bat, and the fluorescent screen of the radar is like the ears of the bat.

Excerpted from "Bat and Radar".

Excerpt from the original text:

After repeated research, scientists finally revealed the secret of why bats can fly at night. As it flew, it made a sound from its mouth. This sound is called ultrasound, which is inaudible to human ears, but can be heard with bat ears. Ultrasonic waves push forward like waves, and when they encounter obstacles, they are reflected back and reach the bat's ears, whereupon the bat immediately changes its flight direction.

Extended information

"Bat and Radar" is the text of Lesson 26 of the sixth unit of the second volume of the third grade Chinese language published by the Shanghai Education Press. This text mainly talks about scientists through repeated experiments. He uncovered the reason why bats can fly at night, and was inspired by it to install radar on airplanes, solving the problem of safe flying at night.

This is a very interesting short article on popular science knowledge. It has clear narrative ideas and strong logic. It can be divided into three parts. Part One: Through the phenomenon of airplanes flying at night, the question of how airplanes can fly safely is raised. This is the main issue to be explained in the full text. The second natural paragraph plays the role of connecting the previous and the following in the article.

Part 2: Scientists conducted three experiments, and the results proved that bats fly at night not by their eyes, but by using their mouths and ears to find their way.

Part 3: Scientists were inspired by bats and installed radar on the aircraft to ensure the safe flight of the aircraft. This research tells people that studying living things can shed some light on human creation and invention. The "Information Kit" on the last page of the text briefly introduces the emerging discipline of modern times - bionics.