PLOS One
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PLOS One (stylized PLOS ONE, and formerly PLoS ONE) is a peer-reviewed open access scientific
作者： tradefree_azrarp
Trade-Free Directory: The ones who offer, should not ask anything in return. The ones who receive, should not have to give anything in return.
WordPress的
4.3 out of 5 stars (based on 4 reviews)
WordPress (WordPress.org) is a free and open-source content management system (CMS) written in
圖書館列表（維基百科）
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圖書館是信息源和類似資源的精選集合，由
WT社交
2.5 out of 5 stars (based on 2 reviews)
WT.Social, also known as WikiTribune Social, is a microblogging and social networking service
世界糧食計劃署
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The World Food Programme (WFP) is the food-assistance branch of the United Nations and the
Unsplash – Photos for everyone
2.0 out of 5 stars (based on 3 reviews)
All photos published on Unsplash can be used for free. You can use them for commercial and
Pixabay
2.0 out of 5 stars (based on 4 reviews)
Pixabay.com is an international, copyleft and free-to-use website for sharing photos,
openstreetmap
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OpenStreetMap (OSM) is a collaborative project to create a free editable map of the world. The
盧森堡的公共交通
3.0 out of 5 stars (based on 3 reviews)
Since 29 February 2020, public transport has been free for everyone, both residents and
The END Fund
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The END Fund is the only private philanthropic initiative solely dedicated to ending the most