美国的国际机场养有受过特殊训练、嗅觉灵敏的小狗。大小行李中如有违禁食品一经发现,警卫当即将食品装入塑料袋内以待销毁。为了不致使旅客惊吓,机场竖立有“我们的狗不咬人”的牌子,并写道:“They The United States’ international airport has puppies that have been specially trained and sensitive to smell. If any illegal food is found in the size of baggage, the guard will immediately put the food in a plastic bag to be destroyed. In order not to frighten visitors, the airport erected a sign that ”our dog doesn’t bite people“ and wrote: ”They