北师大版高中英语模块7--Unit 21 Lesson1-2

（单词翻译）

[00:01.40]Some people use gum¹ to lose weight.
[00:03.55]They say it controls their appetite.
[00:05.77]Further research has been carried out,
[00:07.56]which shows that,
[00:08.80]if you had chewed sugar-free gum
[00:10.54]regularly for the last year,
[00:12.34]it is possible that you would have lost up to
[00:14.20]5 kilos by now.
[00:16.30]They found if people chewed 100 times
[00:18.63]per minute for 12 minutes,
[00:20.70]70 kilocalories were burned.
[00:23.29]Gum can also contain medicine.
[00:25.71]Today, there are gum products
[00:27.45]that help smokers³ give up their bad habit.
[00:30.44]One former smoker² has appeared
[00:31.87]in an advertisement saying,
[00:33.58]"If I had used this chewing gum
[00:35.02]when I was giving up smoking ten years ago,
[00:37.68]I would have been more successful
[00:39.61]at quitting quickly and much healthier today."
[00:43.26]However, we must not forget the negative
[00:45.59]side of chewing gum.
[00:47.25]Diet specialists say we should avoid it.
[00:50.29]Why? They state that chewing starts
[00:52.78]the production of stomach acid⁴
[00:54.33]and digestive juices.If we chew gum,
[00:57.28]it will cause our bodies to believe
[00:59.16]we are digesting food
[01:00.82]and our stomachs will produce digestive juices
[01:03.65]unnecessarily.This will make digestion⁵ more
[01:06.18]difficult and may cause feelings of sickness
[01:09.09]or even headaches.
[01:09.95]