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enum TemperatureUnit {
    // 开尔文，摄氏，华氏
    case Kelvin, Celsius, Fahrenheit
    init?(symbol: Character) {
        switch symbol {
        case "K":
            self = .Kelvin
        case "C":
            self = .Celsius
        case "F":
            self = .Fahrenheit
 
 
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Owner	w3xue
Created	2 years ago
Modified	2 years ago
Visibility	Public