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Question

　　Public-service advertising is generally sponsored by a nonprofit institution, civic group, religious organization, trade association, or political group. Typically, it is directed at some humanitarian cause, philosophical ideal, political concept, or religious viewpoint. Most public-service advertising involves the donation of time or space on part of the medium in which it is featured, although free time or space is not a prerequisite for this type of advertising. Groups such as the Red Cross,United Way, and International Ladies Garment Workers Union have sponsored a great deal of public-service advertising. Advertisements which relate to public issues predate the commercial advertising sector. During the Civil War, the government sold bonds via free newspaper ads which were so effective that they resulted in the first national paid ad campaigns for baking powder, soap and railroad travel. The PSA in its current form was in many ways shaped by the Ad Council (initially called the War Advertising Council) during and after World War II.
　　As an advanced social cultural environment, the public service advertising has a great influence on young people such as moral knowledge, ethics and the development of the character.
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Answer 1

公共服务的广告一般是由一家非营利性机构，民间团体，宗教组织，行业协会，或政治团体赞助。通常情况下，它是冲着一些人道主义事业，哲学理想，政治理念，或宗教观点。大多数公共服务的广告时间或空间的一部分，它的特点是介质中涉及捐赠，但免费时间或空间上，这种类型的广告是不是一个先决条件。团体如红十字会，联合之路，与国际制衣女工联合会赞助了大量的公共服务的广告。其中涉及到公共问题的广告早在商业广告界。南北战争期间，政府通过出售债券免费报纸的广告非常有效，他们在全国首批支付广告发酵粉，肥皂和铁路旅行。 PSA在其目前的形式是塑造广告委员会（最初称为战争广告局）第二次世界大战期间和之后，在许多方面。
公益广告作为一种先进的社会文化环境，如道德知识，道德和性格发展的年轻人有很大的影响。
希望能帮到你。

Answer 2

公益广告通常是由一个非营利机构，发起的民间组织，宗教组织，行业协会，或政治集团。通常，它是针对一些人道主义事业的理想，哲学，政治概念，或宗教观点。大多数公共服务广告涉及时间或空间上的介质具有部分捐赠，虽然自由空间或时间不为这种类型的广告的前提。组织如红十字会，联合的方式，与国际女装工人工会发起了一个很大的公共服务广告。广告与公共问题早于商业广告业。在内战期间，政府通过出售，免费报纸广告是如此有效，它们导致了第一个国家支付的广告宣传发粉债券，肥皂和铁路旅行。在其目前的形式的PSA在许多方面都是由广告委员会形（最初叫战时广告委员会）在第二次世界大战之后。
作为一种先进的社会文化环境，公共服务广告对年轻人的影响很大，如道德知识，道德和性格的发展。
希望能帮到你