This is the audio exerpt of r spoken within a word. It may sound a little short or unclear, but that's exactly how it's in the real context. For more details, read the below explanation of pronunciation and listen example words that contain r by pressing the word buttons.
1. Break the airflow by touching the point above the alveolar ridge with the tip of your tongue.
2. Repeat the interruption to produce a vibrating sound.
3. Vibrate your vocal cords.