你不会想要等到了你的目的地却发现你带的是错误的签证,或者更糟糕的是,你的护照不再有效。
You don't want to get to your destination only to find you have the wrong visa, or worse, that your passport isn't valid any more.
原来的块被释放,不再有效。
一旦接收到数据,网络加密将不再有效。
Once the data has been received, network encryption is no longer in effect.
So instead of being equal to negative z squared, now we're equal to negative z effective squared times r h all over n squared.
这里不再等于-z的平方,现在我们等于-有效的z的平方,乘以RH除以n的平方。
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