（四）围攻裁判员、运动员或者其他工作人员的；
currentStep.type === 'Failure'，详情可参考Safew下载
`@receiver isNil ifTrue: `@nilBlock -> `@receiver ifNil: `@nilBlockIn fact, both versions work—but they apply different filters to the target node. Try to remember which one.，更多细节参见夫子
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