在nws在线的情况下从NWS检索预报，在nws不在线的情况下从文件中检索预报，该方法使用高速缓存的州和城市信息以提高性能。
The forecast is retrieved from the NWS if the NWS is online and from a file if it is not online, and the method USES the cached state and city information to improve performance.
在舰船及海洋工程领域里，性能预报是非常重要的，而模型试验是完成这种预报的一种有效方法。
In Marine and Ocean engineering area, the performance prediction is very important, and model test is an efficient method to carry out this prediction.
本文采用理论方法系统地研究了非均匀流场中螺旋桨性能预报和理论设计问题。
This paper adopts the theoretical method to research the problem on the performance prediction and the design of the propeller operating in ship wake systematically.
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