While proudly  showing   off  his new  fraternity  house  to friends, a college student led the way into the den. "What is the big brass gong and  hammer for?" one of his friends asked.

　　"That's the talking clock", the man replied, with a grin. "Let me show you how it works!" And with that, he gave the gong an ear-shattering　 pound with the hammer.

　　Suddenly someone  screamed  from the other side of the wall, "KNOCK  IT  OFF, YOU  IDIOT!  IT'S  2  AM!"

Key  words：

showing   off　炫耀

fraternity  house　專供社團成員居住的宿舍

den　（n.）巢穴

gong　（n.）銅鑼　click  發音  

hammer　（n.）音槌　click  發音

ear-shattering    　震破耳膜的

pound　（n.）擊