After measuring the transfer characteristic of the PT, the wide frequency model of the PT can be set up with the synthesis method.

当PT的传输特性被测量后，就可以利用该综合方法建立该PT的宽频传输模型。

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MessageLabs, the email-filtering company that Symantec acquired in 2008, posted a set of word maps today measuring the frequency of terms in spam emails from a random one-week sampling of junk mail pulled from the most prolific spam-spewing botnets.

FORBES: The Most Common Words In Spam Email