Conditions are used to determine whether a particular mapping will or will not occur at runtime, thereby providing a way to control the logical flow of mappings.
这些条件用于确定某个特定的映射是否会在运行时出现，从而提供一种方式来控制映射的逻辑流。
Using conditions on mappings allows you to control the logical flow of the mappings.
通过对映射使用条件，可以控制映射的逻辑流。
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