answer: Professor Wang tells #Person1# non-tariff barrier is another mean to restrict imports and used to protect local industries.
documents: #Person1#: Professor Wang, what is non-tariff barrier?
  #Person2#: Non-tariff barrier is another mean to restrict imports.
  #Person1#: Can you give an example?
  #Person2#: For example, some countries restrict imports by quantitative restriction.
  #Person1#: Why?
  #Person2#: This is used to protect local industries or to achieve certain political objectives.
  #Person1#: Oh, Are there other means?
  #Person2#: Technical barriers are set for imported goods.
  #Person1#: This is designed to exclude them from domestic market, isn't it?
  #Person2#: Yes, some countries may use some of the unnecessary health rules to exclude foreign food.