LH: 嘿！Larry, 你今天下午有空吗？想不想和我去打网球？今天天气真好！
LL: I'm sorry, Li Hua, but my bum knee is bothering me. I don't think it's a good idea to play tennis right now.
LH: 你的膝盖怎么啦？Bum knee, 那是什么毛病啊？
LL: I have a bum knee means that there is something permanently wrong with my knee.
LH：原来 a bum knee就是一个膝盖以前受了伤而落下了毛病，也就是老毛病。Larry，你什么时候受的伤，我怎么不知道哪？
LL：I tore a tendon playing soccer several years ago, and now my knee hurts once in a while and it doesn't always bend well.
LL: Yes, having a bum knee or leg is very common, particularly among former professional athletes.
LL: Yes, well many of them do suffer from a bum leg, a bum knee, or a bum shoulder.
LH: 嗯，他们的工资非常高，据说有的年薪都上百万呢！ 筋骨受伤大概只是个小小的代价吧！
LL: That's true, but not all of them make that much money and they still suffer injuries that leave them with a bum joint.
LL: Li Hua. I would play with you if I could. Try to find someone who can play with you. If you can't, give me a call and we can watch a movie or something.
LH: Larry, 我找不着人和我打网球。你还想去看电影吗？
LL: I'm sorry, I can't. My mom just called to tell me that my uncle is in the hospital because he has a bum ticker. I should go and visit him.
LH: 你要去医院看望你叔叔，他怎么啦？Larry，你说你叔叔得了什么病，bum ticker? 什么是ticker?
LL: He has a bum ticker. Ticker is slang for one's heart because your heartbeats similar to the way in which a clock ticks. My uncle has a bad heart.
LL: No, he just had some pains in his chest. He knows that he has a bum ticker, so he went to the hospital to have it checked out.
LL: Well, we've warned my uncle to take care of his old ticker, but he doesn't listen. He still eats junk food and he has a very stressful job.
LL: I hope so, but he has already had a heart attack and surgery, so I doubt he'll change his habits because of a few chest pains.
LL: Okay, bye.