ultrasounds

"...approximately 60 beats per minute."

"The development of this story has been slow."

"He had something of his mother in him."

"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."

"If you still feel unwell tomorrow, see your doctor."

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

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