EGOUZ，国外文化网站，美国国家科学图书馆，文化，
NSDL面向中小学教师、在读大学生、图书馆人员，提供免费的、以国家数学课程标准为核心的数学课程和活动，专家博客还拥有丰富的教师资源、教案和多媒体资源。
NSDL is an online science library with links to high quality science, technology,
engineering, and math resources for K-12 teachers, faculty, librarians, students and informal learners.
The National Science Digital Library provides high quality online educational resources for teaching and learning, with current emphasis on the sciences, technology, engineering, and mathematics (STEM) disciplinesboth formal and informal, institutional and individual, in local, state, national, and international educational settings.
NSDL does not hold content directlyinstead, we provide structured descriptive information (metadata) about web-based educational resources held on other sites by their providers, who contribute this metadata to NSDL for organized search and open access to educational resources via NSDL.org and its services.
Most resources in the library adhere to principles of Open Educational Resource (OER) access, although some resources are restricted to provider site membership, or may have a cost associated with them (indicated in the full record of the resource).EGOUZ，国外网站，外国网址导航，国外网站大全。
