If you visit the US, you will often see it sold at the checkout counters of supermarkets, along with candy bars and chewing gum, of which it is a mental form.
2
约翰·柯蒂斯用云杉树液做出了美国第一个包装口香糖。
John Curtis created the first American packaged gum using spruce sap.
3
上课的时候吃零食、喝饮料或者嚼口香糖,这在美国被认为是不礼貌的行为。
It is considered impolite in the U.S. to eat, drink or chew gum during class.