free是自由，那smoke free可以自由吸烟？千万别理解错了！

Smoke-free 无烟的 Sir. This is a smoke-free restaurant. You can't smoke here. 先生。这是无烟餐馆。您不能在这吸烟。 No smoking or vaping. 禁止吸烟或吸电子烟 vape v. 吸电子烟 e-cigarette 电子烟 alcohol-free 不含酒精的 A: I am sorry I can't drink alcohol. 不好意思我不能喝酒。 B: Don't worry. It's an alcohol-free drink. 别担心。这个酒不含酒精。 duty-free 免税的 We got a lot of duty-free stuff while we were waiting at the airport. 候机的时候我们买了很多免税的东西。 sugar-free 不含糖的 Sugar-free gum does not have any sugar in it. So it doesn't cause tooth decay. 无糖口香糖不含糖。所以不会引起蛀牙。 interest-free 无息的 The card offers 59 days' interest-free credit. 该卡提供59天免息的额度。 stress-free 没有压力的 No working environment is entirely stress-free. 没有哪个工作环境是完全不存在压力的。