there is a black tray at the bottom of the fly trap, which contains some bait. The fly-catching cage uses the characteristic that flies can only fly obliquely upwards when taking off. When the flies fly into the tray and eat food, they will be covered by the conical gauze above, so they have to enter the birdcage-shaped gauze cage around it from the small hole at the top, and they can't escape until they starve to death.

flies mostly feed on rotten organic matter, so they are often found in poor sanitation environment. Flies have sucking mouthparts, which will pollute food and spread diseases such as dysentery.

pale

flies are harmful to human beings because they carry a variety of pathogenic microorganisms. The body surface of flies is hairy, the foot pads can secrete mucus, and they like to crawl in human or livestock feces, sputum, vomit and corpses for food, and it is very easy to attach a large number of pathogenic organisms, such as Vibrio cholerae, Salmonella typhi, Shigella dysenteriae, Hepatitis B, Polio, Hepatitis A and Polygonum. They often stay on human body, food and tableware, and they have the habit of rubbing their feet and brushing their bodies when they stop < P >, and the pathogens attached to them will soon pollute the food and tableware. When flies eat, they first spit out crop juice and dissolve the food before inhaling, and they eat, spit and pull at the same time. In this way, the pathogens that were originally eaten in the digestive juice will be spit out together, polluting the food it has eaten, and people will get sick if they eat these foods again and use contaminated tableware. The epidemic of cholera, dysentery and bacterial food poisoning are directly related to the spread of flies, but it is not useless. Without it, human beings will be trapped in a putrid place.