Bāngjiāo zhèngcháng huà shì yíge màncháng de guòchéng.
Normalization of diplomatic relations is a long process.
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Formal. Common in news and government contexts: 建立邦交 (establish relations), 断绝邦交 (sever relations), 邦交国 (nations with diplomatic ties). Everyday speech prefers 外交关系.
