In a recent discussion on the Agile usability group, members discuss various ways for evaluating system usability.

最近，在Agile Usability邮件组中，成员讨论了各种方法来评价系统的可用性。

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In these cases, information-system usability is directly influenced by a user's ability to track along a search trail.

在这些情况下，用户沿搜索线索跟踪的能力会直接影响到信息系统的可用性。

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Therefore, don't treat all messages and applications the same; otherwise, there is an unnecessary security tax levied on the overall system that affects performance and overall system usability.

因此，不要均按照同样的标准处理所有消息和应用程序，否则就可能对整个系统造成不必要的安全负担，从而影响系统的性能和可用性。

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In addition, it is powered by an updated version of the Leaf OS, a custom operating system designed for payment security, speed and usability.

ENGADGET: Leaf unveils next-gen LeafPresenter Android POS tablet for taking payments

But Mozilla must overcome usability issues before phones that carry its operating system get into the hands of consumers, even if they are being classed as cheap alternatives to Android phones.

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