他花了几年时间来规划路线、听天气预报、寻找最佳地图，他真的喜欢一个好的挑战。
He spent several years in planning his route, listening to the weather report and finding the best maps, and he really likes a good challenge.
然而，如果天气状况一天天地显著变化，持续性方法常会出错，所以这不是制作天气预报的最佳方法。
However, if weather conditions change significantly from day to day, the persistence method usually breaks down and is not best forecasting method to use.
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