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cov khoom

Lub nruas chav tsev hauv lub tshuab luam ntawv yog ib qho tseem ceeb ntawm cov khoom siv los hloov cov duab thiab cov ntawv rau ntawv.Nws muaj ib lub nruas rotating thiab cov khoom siv photosensitive uas tsim kom muaj hluav taws xob ntawm lub tshuab luam ntawv thiab hloov cov duab rau hauv daim ntawv.