Note: If you do not enable this conditional compilation flag, you will get the release version of the driver object that will be used in the target environment.
注：如果我们没有启用这个条件编译标志，那么就可以得到一个可以在目标环境中使用的驱动程序对象文件。
When an object is removed from the working memory, any conditional elements (of any rule) that had a reference to this object cannot be evaluated now.
当从工作内存中移除对象之后，引用该对象的（属于任何规则的）任何条件元素将不被求值。
The rule shown in Listing 10 has one conditional element that references a Machine object.
清单10中显示的规则有一个引用Machine对象的条件元素。
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