Therefore, it is possible to realize {HEAD ~ a method} for transmitting {TAIL ~ an ultrasonic wave}, the method having a high flexibility of detection area control 
for transmitting
Therefore , it is possible to realize { HEAD ~ a method } for transmitting { TAIL ~ an ultrasonic wave } , the method having a high flexibility of detection area control
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH