代理的字节代码一变更，旧的用户签名就变成无效的了。
As soon as the byte codes of the agent change, the old user signature becomes invalid.
通过使用缓存代理，每个页面都只需从门户交付一次，然后此页面将驻留在缓存中(直到内容无效时为止)。
By using caching proxies, each page would be delivered from the portal only once and then reside within the cache (until the content becomes invalid).
但是在面对谴责时Brazilian Blowout在网页上刊出呼吁：检测无效，是安全代理机构严重失误所致。
But in response to the criticism, Brazilian Blowout put up a web page calling the tests invalid and saying the safety agency was grossly negligent in its testing.
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