If pessimistic session locking is used, it should generally only be used to block other users from updating; it should not block reads of the locked data.

如果使用悲观会话锁定，它通常只用于阻止其他用户进行更新，而不是阻止对锁定数据的读取。

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Users access the DRBD block devices as a traditional local block device or as a storage area network or network-attached storage solution.

用户访问DRBD块设备，将其作为一个传统本地块设备，或一个存储区域网或网络附加存储解决方案。

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The tracking protection will be an opt-in feature for users to identify and block certain forms of website tracking.

跟踪保护功能将会以可选特性的形式帮助用户识别并拦截某些形式的网站跟踪。

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Companies might choose to block users in particular countries from accessing their sites, rather than be subject to those countries' laws, or decide against doing business online altogether.

ECONOMIST: Regulating the Internet

We have had to make the decision to block all users accessing geographically restricted content via 3G cards.

BBC: Your guide to the BBC Embedded Media Player

Odigo made its software interoperable with AOL's AIM and ICQ messaging services last year only to have AOL block Odigo users after a couple of weeks.

CNN: AOL rivals team on IM interoperability