Instructions: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Input: Sentence: 'Shanghai is China 's center is now that carrier has an antitrust-immunized global alliance with Air France-KLM , which is the next seven on Barack Obama .', Argument/Subject 1: 'shanghaus', Argument/Subject 2: 'china'
Output:
be center of