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At ordinary times, eustachian tube by extrusion and surrounding tissue in the export of nose pharynx ministry in closed state, but when the baby swallowing, chewing, sneezing, or crying, in order to maintain the balance of inside and outside the middle ear pressure, open eustachian tube is a moment. Because the baby's ear has not yet developed, eustachian tube is relatively short, low and flat, and position if you cross holding the baby, let him lie on your back with milk, milk bottle mouth open too large, bottles, vertical too straight, etc., are likely to cause the baby choking milk, and make the milk along the eustachian tube into the middle ear, induce otitis media.
Based on the complexity of today's technology, the pure practice of technology will require a great understanding, which is the result of many years of experimentation, success, failure, and general experience. Therefore, a great deal of knowledge needs to be stored and passed on to the next generation by experts. Its training and education are conducted in formal and informal education institutions, schools, colleges and universities. Imagine the vast knowledge needed to enter careers such as medicine, engineering and architecture
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