词汇	focal area for sound
释义	focal area for sound 声焦点
随便看	center of face Center of face center of falls center of femoral head center office of postal area center official school center of figure center of filter Center of Filtering and Plotting center of fiqure center of flexure center of floatation center of flotation center of fluorescence center off-measurement center of force center of forecasting and analysis center of foreign exchange control center of forging die center of form center-off polarized relay center of friction center of fuzzy-set gravity center of fwist center of geodestic curvature