签名公钥有数字签名(非常类似于人工签名)来表明签署者对公钥的担保。
A signed public key has a digital signature (quite analogous to a human signature) that states that the signer vouches for the public key.
媒体作为社会公器，对公共危机的有效预防与控制具有不可推卸的责任，而且媒体的正当干预又是化解此类危机的有效手段。
Media, as a social utility, has compelling obligation to effectively prevent and control public crisis. In fact, proper intervention of media is an effective way to resolve the crisis.
在我抵达那里的几天之后，一只母牛在生产一对小牛时不幸过逝了，牠们是一对公与母的小牛。
A few days after my arrival there, a cow died giving birth to twin calves, one male and one female.
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