Text Analysis: Main Idea and Devices for Developing It Back Main idea of the text The passage is about five famous symbols of American culture, telling readers their historical backgrounds, origins and relevant stories。 Devices for developing it? 标题法 时间法.Text Analysis: Main Idea and Devices for Developing It The passage is about five famous symbols of American culture, telling readers their historical backgrounds, origins and relevant stories. Main idea of the text ? Devices for developing it? Back 标题法 时间法