Zhè cì fǎngwèn jiāshēn le liǎng ge yǒubāng zhījiān de chuántǒng yǒuyì.
This visit deepened the long-standing friendship between the two friendly nations.
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Formal and diplomatic, mostly in speeches and news reports. 邦 is the literary word for a state, as in 邻邦 'neighbouring country' and 联邦 'federation'; everyday speech says 友好国家.
