National Science Digital Library

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) disciplines—both formal and informal, institutional and individual, in local, state, national, and international educational settings. The NSDL collection contains structured descriptive information (metadata) about web-based educational resources held on other sites by their providers. These providers have contribute this metadata to NSDL for organized search and open access to educational resources via this website and its services.

国家科学数字图书馆提供高品质的在线教育资源，致力于教学与学习，当前重点在于科学、技术、工程与数学（STEM）学科——涵盖正式与非正式、机构与个人、地方、州级、国家级及国际教育环境。NSDL收藏包含关于存储在其他网站并由其提供者所持有的网络教育资源的有结构描述信息（元数据）。这些提供者已将此元数据贡献给NSDL，以实现本网站及其服务下的教育资源的有组织检索和开放访问。