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