Diggers assembled in Brazil by Chinese firm Sany
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China's big investment in Brazil raises concerns

16 November 2012 Last updated at 00:04 GMT

China is Brazil's biggest trade partner, but not everyone in the South American country is happy about the relationship, reports the BBC's Paulo Cabral.

With Chinese investment in Brazil now totalling $25bn (£16bn), some Brazilian school children are starting to learn Mandarin.

Yet critics of Brazil's relationship with China, question whether Brazil should be exporting its raw materials to China, only to then buy Chinese products.