Article 10 of the European Convention guarantees free speech.
《欧洲公约》第10条保障言论自由。
《牛津词典》
2
Publishers have responded to the demand that they make their product free to readers by charging their writers fees to cover the costs of preparing an article.
为满足免费向读者提供文献的需求，出版机构通过向作者收费来负担其准备论文的费用。
3
This Free PDF library is what I use in this article.