A little old grand-pa  goes to the doctor and says, "Doctor, I have this problem with gas, but it doesn't really  bother  me too much. They never smell and are always silent. As a matter of fact, I've farted at least 20 times since I've been here in your office. You didn't know I was farting because they don't smell and are silent."

　　The doctor says, "I see. Here's a prescription. Take these pills 3 times a day for seven days and come back to see me next week."

　　The next week the grand-pa  goes back. "Doctor," he says, "I don't  know what the hell you gave me, but now my farts ... although still silent... stink terribly."

　　The doctor says, "Good! Now that we've cleared up your sinuses, let's start working on your hearing."

Key  words：

smell 　（v.）發出臭味　click  發音  

fart　（v.）放屁

prescription　（n.）處方　　click  發音   

pill　（n.）藥丸、藥片　 click  發音  

sinus　（n.）鼻竇　click  發音 

hearing　（n.）聽力　  click  發音