三者都提供免费下载的试用版本，并且我们推荐您阅读其中的产品说明去学会怎么使用它们。
All three provide free downloadable trial versions, and we recommend that you read the instructions that come with these products to learn how to use them.
告警数据集在网站上提供免费下载，可作为告警关联分析和研究使用的标准数据集。
These datasets can be downloaded freely on the Web and used as the standard datasets for alarm correlation analysis and study.
在网上，有些类似于“大杂烩”式的网站，向读者提供免费下载服务，但他们没有自己的原创内容。
On the web, similar "aggregator" sites, personalised or not, have a bad name as freeloaders that create no content of their own.
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