第一种方法是命令帮助的最基本用法。
The first method is the most basic use of command assistance.
尽管许多数据类型和基本的表达式是相同的，但是它们的用法和应用不太一样。
Although many of the data types and fundamental expressions are the same, their use and application is slightly different.
基本反射率数据的一种常见用法是显示某地区实际上晴天时的等效弱降水。
A common occurrence for the base reflectivity data is to show the equivalent of light precipitation where there is in fact clear skies.
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