ultrasound

"...approximately 60 beats per minute."

"The students are developing their reading skills in their English class. "

"Children grow quickly."

"The doctor prescribed a therapeutic for her persistent headaches. "

"A great storm is approaching our shores."

"The student studied hard with the purposes of getting good grades and graduating on time. "

"The doctor used a series of diagnostic tests to determine the cause of the student's persistent headaches. "

"I was deaf, and now I can hear."

"The frequency of bus service has been improved from one every 15 to one every 12 minutes."

"The dog whistle emits an ultrasonic sound that humans can't hear, but dogs can. "

"He examined the crime scene for clues."

"The radio station broadcasts at a frequency of 980 kilohertz. "