同时，如果没有读取权限，则无法检视共用物件的状态，进而限制这些物件的使用性。
Also, without read access, the state of Shared objects cannot be viewed, which limits their usefulness.
它没有足够的权限来读取队列本身之外的任何东西，因此必须亲手发送邮件。
It does not have sufficient permissions to read out of the queue itself, and so must be handed the message to deliver.
它没有足够的权限来读取队列本身之外的任何东西，因此必须亲手发送邮件。
It does not have sufficient permissions to read out of the queue itself, and so must be handed the message to deliver. It can even be used alone as follows.
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