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How about China Life Education Training Lecturer?
Not every lecturer has it. Your friends have no insurance, but many people have cancer. Because people themselves can't bypass cancer! In the past, communication was underdeveloped, and everyone was unfamiliar with cancer (malignant tumor). Nowadays, there are more and more toxic food and industrial pollution, and the incidence of illness is very high. Just because you don't feel it doesn't mean no one is sick.