Permission system comprises four main parts: user part, object part, operation part and task.
系统分为四部分：主体部分、客体部分、操作部分和任务部分。
Care should be taken before granting code permission to access certain system properties.
在授予给代码以访问某些系统属性之前应谨慎。
Care should be taken before granting code permission to access certain system properties.
在授予给代码以访问某些系统属性之前应谨慎。
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