如果数据库中没有适用于请求日期的预报，那么WeatherPredictor会随机生成天气预测(与实际的天气预报不同)，并将它保存到数据库中。
If no prediction is available in the database for a requested date, the WeatherPredictor generates a random prediction (rather like real-life weather forecasts) and saves it in the database.
建立和完善气象灾害预测预报体系，做好灾害性、关键性、转折性重大天气预报和趋势预测。
Establish and improve the meteorological disaster forecast system, do a good job in disaster, key, turning weather forecast and trend forecast.
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