normal body temperature is not a specific temperature point, but a temperature range. the body temperature in the deep parts of the body is relatively constant and uniform, and is called deep body temperature; while the temperature on the surface of the body is affected by many factors and has large changes and differences, and is called surface temperature. clinically referred to as body temperature refers to the average deep temperature. generally represented by the body temperature of the mouth, rectum and axilla, the rectal body temperature is closest to the deep body temperature. normal values: the oral sublingual temperature is 37°c (range 36.2-37.2°c), the rectal temperature is 37.5°c (higher than the oral temperature (0.3-0.5°c)), and the axillary temperature is 36.5°c (range 36.0°c-37.0°c).