Chewing gum, once bought primarily by adolescent boys, is now featured in commercials as a breathfreshener and teeth cleanser for use after a meal.
曾经主要由青少年购买的口香糖，现在在广告中被用作饭后的口气清新剂和牙齿清洁剂。
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Lemon is known to have been used by the Romans as a treatment for stomach upsets and also as a breathfreshener. The British Navy have also used it in the past to aid the prevention of scurvy.