This is a quick stress reducer, and free of cost.

这是一个快速应力减速器，和免费的成本。

Customers can download the demos and try them free of cost.

客户可以下载演示和尝试，他们免费的成本。

The orphans of AIDS patients to go to school free of cost.

对艾滋病病人的孤儿免收上学费用。

This information is available free of cost on a number of websites.

这些信息在很多网站都是免费的。

If the watch breaks down within a year, we will fix it free of cost.

如果这个手表在一年之内出现故障，我们将会免费维修。