var allcodes String String 添加键值队
var allcodes: [String: String] = [:]
// 添加键值对 allcodes["USA"] = "United States" allcodes["CHN"] = "China" allcodes["JPN"] = "Japan"
print(allcodes) // 输出: ["USA": "United States", "CHN": "China", "JPN": "Japan"]
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