Several years back there was a public service announcement that ran on television.

几年前，在电视上有个公益广告。

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Facebook's announcement of its Messages service is just the most prominent evidence of how electronic communications are changing in a fundamental way.

Facebook宣布推出消息服务平台这一举措显示，电子通讯正在经历一场根本性的变革。

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The announcement is just the latest sign of a sad and increasingly dire fact: the Postal Service is in shambles.

此通告只不过是一令人悲哀而可怕的事实的又一征兆——美国邮政管理局步履维艰。

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This Public Service Announcement, produced by the Defense Media Activity, prompts service members, veterans, and their families to know the signs of stress that can lead to suicide and to contact the Military Crisis Line through Militarycrisisline.net or by calling 1-800-273-8255, press 1.

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Numerous radio and television networks have promised to air public service announcement as well.

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And no, this is no well-meant public service announcement decrying excessive holiday spending gone awry.

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