零起点美语-What's the Point of Chewing Gum?

What's the Point of Chewing Gum?

Being an American, Donna wants to learn more about the Chinese. She's talking to her Chinese friend, Jeff. (D=Donna; J=Jeff)
D : Hi, Jeff! What's up?
J : Nothing much. What about you?
D : Same as usual. Here, have a stick of gum.
J : No, thanks. I'll stick to my own brand.
D : And what brand's that?
J : Actually it's not gum. I eat raw garlic instead. Want a piece?
D : No way! So that's where the stinky smell is coming from.
J : Hey! Watch your tongue, OK? Garlic kills germs.It's good for you.
D : Says who?
J : Well, according to...
D : Never mind. Please stop talking. Your breath stinks. I'm out of here.
J : Boy! These Americans don't know what's good for them. Besides, what's the point of chewing gum anyway?

身为美国人, 唐娜很想多了解中国人。她正在和她的中国朋友杰夫说话。
唐娜：嗨, 杰夫！近来如何？
杰夫：没什么, 你呢？
唐娜：老样子。喏, 来一片口香糖吧。
杰夫：不, 谢了。我还是用我的老牌子好了。
唐娜：什么牌子啊？
杰夫：其实不是口香糖。我是吃生的大蒜。要来一块吗？
唐娜：才不要呢！原来那股臭味就是从你那里传来的。
杰夫：嘿！说话当心点, 好吗？大蒜能杀菌, 对你身体有益。
唐娜：谁说的？
杰夫：嗯, 根据……
唐娜：算了, 请别再说了。你有口臭, 我走了。
杰夫：天啊！这些美国人真不识货。而且, 嚼口香糖到底有什么意思？