Chinese language does not have alphabets. It is written with symbols. Those symbols are called Chinese characters. Chinese writing is logographic, every symbol represents a word or a minimal unit of meaning.
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The stethoscope was invented in 1816 when a young French physician named Rene Theophile Hyacinthe Laennec was examining a young female patient. Laennec was embarrassed to place his ear to her chest ( Immediate Auscultation ), which was the method of auscultation used by physicians at that time.