{HEAD ~ A larger area} of the transmission surface causes the ultrasonic wave to have {TAIL ~ a larger sound pressure} 
{ HEAD ~ A larger area } of the transmission surface causes the ultrasonic wave to have { TAIL ~ a larger sound pressure }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL