System and method to uniformly access devices. The interference canceller includes a plurality of correlators or matched filters, a plurality of spread-spectrum-processing circuits, subtracting circuits, and channel correlators or channel-matched filters. The first indicating line establishes a straight line extending along an equator on the surface of the golf ball to form a first direction indicating line, on which a starting point and an ending point are identical. The hydraulic circuit also includes a hydraulic motor operably coupled to the fan wherein the hydraulic motor is in fluid communication with and driven by the hydraulic pump. The fetal weight of the case under examination is predicted by using a mathematical prediction model and a multinormal probabilistic model is used as a mathematical model.