Shanghainese and non-Shanghainese can be distinguished almost at a glance. A foreigner can be recognized as soon as he enters Shanghai, even if he is loaded with sea goods. Similarly, a small number of Shanghainese will also be concerned by the public when they go abroad. Even if they wear local clothes, they can't speak Shanghainese. Of course, people in other places are also easy to identify, such as Beijingers and Cantonese. However, Beijingers can hardly change the "Beijing flavor" when they speak, while Cantonese people often have obvious appearance characteristics besides "showing their stuffing" when they speak. Only Shanghainese can distinguish themselves from foreigners by their appearance, mainly their accent. To put it bluntly, what distinguishes Shanghainese from foreigners is their unique "Shanghai flavor". Almost all outsiders can feel this smell, and sensitive people can "smell" it at once.