当定义一个影子复制时，它的状态总是和基本复制的状态一样。
When you define a shadow replicate, its state is always set to the same state as the primary replicate.
如果改变基本复制的状态，则它的所有影子复制的状态也随之发生相同的改变。
If you change the state of the primary replicate, all its shadow replicates' states are also changed to the same state.
对于手动re - mastering，在创建影子复制之后，接下来的步骤是使用cdr swap shadow命令交换基本复制和影子复制。
After creating the shadow replicate, the next step in manual re-mastering is to switch the primary replicate and the shadow replicate using the CDR swap shadow command.
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