他说美国已经超过日本，成为了世界上最成熟的电子商务市场。
He said the US had overtaken Japan as the world's most developed market for mobile Internet.
中国已经超过日本在2007年成为美国第三大出口市场，仅次于加拿大和墨西哥。
And China is now the country's third-largest export market. China surpassed Japan in 2007 and trails only Canada and Mexico.
问：根据最新数据，中国已经超过日本，成为世界第二大经济体，这引起外界对于中国实力的担忧。
Q: the latest data shows that China has overtaken Japan to become the second largest economy in the world, raising the outside's concern about China's national strength.
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