每个服务提供者都拥有一个私钥，将在消息送达主题时使用其正确地解密自己的消息。
Each service provider owns a private key and USES it to correctly decrypt its own messages when coming to the topic.
短时间内我们不可能完全摒除垃圾邮件，与此同时，垃圾邮件发送者也在寻找除了电邮之外的送达方法。
We won't be rid of spam anytime soon, and these days of course spam also finds its way into other delivery methods than email.
尽管救援物资被送达到了地震幸存者的手中，但是低温和余震依然威胁着灾区额度民众。
While relief supplies are reaching more earthquake survivors, low temperatures and aftershocks continue to make life miserable for the population of the earthquake-stricken area.
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