Acoustic phonetics is the study of the physical properties of speech.

He crossed the border and fled to the neighboring country.

He chose a stable job, saying 'a bird in the hand is worth two in the bush.'

He is receiving treatment for obsessive-compulsive disorder.

Please let me hear your opinion, sir.

Have you ever been to Hanawa?

Please open the door.

I have been to Amami.

What are the indications of that disease?

The train was full.