ทวีปที่พูดภาษาจีนมีกี่ทวีป?
What is the number of distinct continents where Chinese is spoken?
country = pd.DataFrame(columns=['Code']); countrylanguage = pd.DataFrame(columns=['CountryCode', 'Language'])
country[country['Code'].isin(countrylanguage[countrylanguage['Language'] == 'Chinese']['CountryCode'])]['Continent'].nunique()