Searching and sorting through this data is difficult, as is maintaining the consistency of data across users and locations.

通过该数据进行搜索和排序是困难的，因为是维护跨用户和位置的数据一致性。

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Another disadvantage of inheritance is that as the number of different classes of users increases, the various combinations become numerous and increasingly difficult to maintain.

继承的另一个缺点是随着不同user类的数量的增加，各种组合也变得数目众多，维护起来越发困难。

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Automating tacit interactions is difficult because of the inherent variability; that is, users try to do something different every time.

自动化隐含交互很难实现，这源于其固有的变化性，也就是说，用户每次都尝试做不同的事情。

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Our only complaints with the design are the size of the WiFi key (gloved or ham-handed users may find it difficult to press) and the lack of some sort of tab, notch or spring to help open the battery door.

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And indeed with a list of status updates running down the page, a box at the top inviting you to "share what's new" and a box of profile photos to the side, it won't be difficult for new users to get the hang of the whole idea.

BBC: Trying out Google+

Councillor David Lindores, the chairman of the access group, says it is still difficult maintaining parity between the interests of recreational users of the outdoors and landowners.

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