他们的售后服务免费。

Their after-sales services are free of charge.

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一件技术型创业者常作的事情是把产品或服务免费公开，计划以后再加入商业模式。

One thing technical founders often do is put the product or service out for free, planning to put in the business model later.

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此次信号覆盖范围包括二环、三环、CBD、金融街、中关村等地区。奥运期间此服务免费。

The service, free of charge during the Olympics, covers the Second and Third ring roads, CBD, Financial Street, and Zhongguancun.

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