This role-play is performed by adults. My younger sister, who had just returned from studying abroad for a medical checkup, had my older brother, a medical student, do a simple health check for me... The older brother held a stethoscope to his chest and tilted his head. Apparently, multiple heart sounds were confirmed... And they were completely different from human heart sounds... To confirm that something was wrong, the older brother palpated it... but he couldn't figure out the cause at all...