answer: #Person1# and #Person2# are talking about language differences that contain the nation's culture, view of life, way of thinking, and are very important in foreign trade.
documents: #Person1#: In foreign trade, language differences are very important.
  #Person2#: Yes. If people can not communicate with each other easily, they can not understand each other's way of thinking.
  #Person1#: Fortunately, there is a widely-spoken commercial language, namely English.
  #Person2#: Many exporters speak French and German as well.
  #Person1#: In South America, the most common language is Spanish and Portuguese.
  #Person2#: Even if the language is accurate, a misunderstanding can not be avoided due to cultural differences.
  #Person1#: Yes, the language is a part of culture. It reflects a nation's character.
  #Person2#: Yes, it not only includes the nation's historical and cultural background, but also contains the nation's view of life way of life and way of thinking.
  #Person1#: So in foreign trade, you must be very clear about language differences.