As a result, these add-on features end up being more of a reliability mechanism than a security mechanism.

结果，与其说这些添加的功能部件是安全性机制，不如说它们是可靠性机制。

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Companies have long hoped to make money from this freely available software by charging customers for support and add-on features.

开源公司一直向用户免费提供开源软件，长期以来，开源公司希望能够从提供技术支持和附加功能来获取资金。

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Add enough add-on features and you can reduce the viewing window to a size of a postage stamp, but there is probably no better overall browser.

它添加了足量的附加组件，全部打开可以把显示窗口压得只有邮票大小，不过也许真的找不到一款更优秀的全能浏览器了。

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The third-party call centers it had hired used high-pressure sales tactics to sell consumers add-on features to their credit cards but misled them about the benefits.

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Rather than charge users to buy software, publishers opted for a "freemium" model, in which the basic product was given away but premium add-on services or features involved payment.

BBC: Dead Space cheat undermines in-game micro-transactions

Overall, this fitness site is lean on graphics but the editors promise to work on that and add new features including a Spanish-language version in the near future.

CNN: Site Seer: Get fit on the Net