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In page One country, two systems:

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As Macau has its own currency, the Chinese renminbi is not legal tender in Macau; the pataca is also not accepted in stores in China.[citation needed] With this agreement, a permit or visa is required when crossing between the borders of Macau and China, and people in Macau generally hold Macau SAR passports rather than mainland Chinese passports. Like Hong Kong, the official languages are a major factor that has made Macau and China distinct from each other besides the history of the former colony, as Cantonese and Portuguese are the official languages in Macau, while Mandarin is the official language of China. The central government in Beijing also maintains control over Macau's foreign affairs as well as the legal interpretation of the Basic Law.