有人能教教我这个怎么做吗

随便找个翻译，接一下他们的开放平台就可以

http://fanyi-api.baidu.com/doc/11

你要自己写一个翻译软件啊？？

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    int freezingPoint = 0;
    int boilingPoint = 100;
    int boilingUnit = 300;
    System.out.println("What is the temperature(degrees Celsius)?");
    int temperature = scanner.nextInt();
    System.out.println("What is the altitude(metres above sea level)?");
    int altitude = scanner.nextInt();
    int realBoilingPoint = 100 - altitude / boilingUnit;
    if (temperature <= freezingPoint) {
        // 固体
        System.out.println("Water is solid at these conditions");
    } else if (temperature >= realBoilingPoint) {
        // 气体
        System.out.println("Water is gas at these conditions");
    } else {
        // 液体
        System.out.println("Water is liquid at these conditions");
    }
}