FSI开放式英语学习网是美国 Foreign Service Institute为了foster the learning of worldwide languages而开放的non-profit学习资源，网页上有各种主流语言的学习教程，每个语种分不同级别，配有一本PDF和配套音频，全部免费下载。

FSI-Language-Courses开放式英语教程的主导思想是不断地重复重复再重复，直到your response becomes automatic!该网站上的所有课程都是有美国政府开发的，并应用于公共领域，通过电子文档的方式来免费使用，该组织是一个非营利性质的平台，以促进世界各地语言的交流和学习。

These courses were developed by the United States government and are in the public domain.

This site is dedicated to making these language courses freely available in an electronic format. This site is not affiliated in any way with any government entity; it is an independent, non-profit effort to foster the learning of worldwide languages. Courses here are made available through the private efforts of individuals who are donating their time and resources to provide quality materials for language learning.