This is an impressive drop, but still leaves a 20 percent increase in mouthcancer risk compared to the use of no tobacco at all.
这是一个了不起的下降，与不使用烟草相比仍有20%的口腔癌的发病风险。
2
In the last 10 years, mouthcancer has become much more common and one reason for this could be because of higher levels of drinking - as this study reflects.
研究反映，过去十年以来，口腔癌已变得越来越普遍，而其中一个原因可能是喝酒水平的提高。
3
The first sign of oral cancer is often a tiny white or red spot in the mouth, but the disease can be detected before a sore appears.