求翻译：美国作为超级大国，自然，广告的发展也走在世界的前列，而被认为是最主要和最古老的广告形式之一的招贴广告，在美国也有着自己特有的发展历程，并且对世界招贴设计产生了深刻的影响。美国的招贴广告是如何一步步发展成如今的状况的，它与科技文化同步，在每个时期都有着不同的表现形式和风格特征，带有鲜明的时代特征。是什么意思？

The United States as a superpower, natural, advertising development to go in the forefront of the world, and is considered the most important and one of the oldest forms of advertising poster advertising in the United States also has its own unique course of development and poster design for the wor

The United States, as a superpower in the world, naturally, the advertising of development also lead the world, is considered to be the most important and the most ancient forms of advertising of the poster, in the United States also has its own unique history of the development of worldwide poster

US took the superpower, the nature, the advertisement development also walks in the world front row, but was considered is most main and of a handbill poster notice advertisement most ancient advertisement forms, also has in US oneself unique development course, and has had the profound influence to

United States as a superpower, natural, could go in the forefront of world development of advertising, and is considered to be the most important and one of the oldest forms of advertising poster, in the United States also has its own unique history and poster design have had a profound impact on th

United States as a superpower, natural, could go in the forefront of world development of advertising, and is considered to be the most important and one of the oldest forms of advertising poster, in the United States also has its own unique history and poster design have had a profound impact on th