以下是5個常用免費網站的說明與特點：
Elsevier Open Access Journals: Elsevier is a publisher of scientific, technical, and medical literature. They offer a range of open access journals that have undergone peer review and are free to read and download upon acceptance . You can search for open access journals by title, keyword, or subject .
Google Scholar: Google Scholar is a search engine that allows you to search for scholarly literature across various disciplines and sources such as articles, theses, books, abstracts, and court opinions . It provides a simple way to find relevant research papers.
JSTOR: JSTOR is a digital library of academic journals, books, and primary sources. It offers access to millions of high-quality primary sources and images from around the world, including artworks, maps, photographs, and more . You can explore collections in the arts, sciences, and literature from the world’s leading museums, archives, and scholars. (Journal STORage，意為期刊儲存），創立於1995年，是一個提供學術期刊內容的線上網站。使用者通過該網站可以全文搜尋發表在數百本知名學術期刊上的文章的電子版內容。
PLOS Open Access: PLOS is a nonprofit open access publisher that empowers researchers to accelerate progress in science and medicine by leading a transformation in research communication . They publish influential open access journals across all areas of science and medicine. Their journals are rigorously reported, peer-reviewed, and immediately available without restrictions.
PubMed: PubMed is a free search engine that provides access to biomedical literature from MEDLINE, life science journals, and online books 6. It comprises more than 36 million citations for biomedical literature. Citations may include links to full-text content from PubMed Central and publisher websites.
以上是我們對這些網站的簡要介紹，希望能對您有所幫助。
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