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40, 100, 400, 1000, analysis, anticorrosion, bacteria detection, biology, biotechnology, blood sample, brightness adjustment, cancer cell detection, cell observation, clarity, clinical examination, disease diagnosis, doctors, dustproof, electron microscope, experimental operation, experimental teaching, eyepiece, fault repair, fixed specimen, fluorescence microscope, focusing knob, halogen lamp, led, light source, magnification, maintenance, medical laboratory, medical research, medical students, microscope closeup, objective lens, optical microscope, pathological section, regular calibration, resolution, sample preparation, scientific researchers, shockproof, specimen observation, stage, staining technology, times, tissue sample, tube, virus detection,