The newly discovered skeleton has a history of more than 6,200 years, and scientists have found evidence of the earliest known parasite infection. Archaeologists discovered a parasite egg parasitized near the pelvis in northern Syria, saying it dates back to the first time that ancient societies used crop irrigation systems. Scientists suspect that the new agricultural technology means that people spend a lot of time wading, creating ideal conditions for parasites to enter the human body. This may trigger an outbreak of water-borne flatworm disease, also known as schistosomiasis.
The invention of irrigation was a major technological breakthrough, but flatworm parasites lived in warm fresh water at the time, and tiny worms could penetrate human skin. After growing into adults, they live in the bladder, the intestines and other parts of the body for many years. Symptoms that parasites can cause include fever, rash, abdominal pain, vomiting, and thigh paralysis. Ancient agricultural societies may inadvertently initiate the global spread of flatworm parasites, which cause diseases to millions of people every year. Today, modern irrigation systems continue to spread diseases in developing countries.
The cylinder liner is a part of the engine. It has good heat dissipation, uniform cooling and easy processing. Usually, only the inner surface needs to be finished, and the outer surface in contact with water does not need to be processed, and the disassembly and assembly is convenient, but the disadvantage is that the strength and rigidity are not as good. Dry cylinder liners are good, and water leakage is easy to occur. Some leak prevention measures should be taken.
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