正如我们前面提到的，每一个建筑地盘是不同的。
As we mentioned before, each construction site is different.
正如我们前面提到的，选择器可以决定调用哪一个实现。
As mentioned, selectors can decide which implementation to invoke.
正如我们前面提到的，您需要防范来自内部和外部的威胁。
As we stated earlier, you need to protect against internal as well as external threats.
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