论坛上常常出现的一个问题是，如何对某些用户禁用su。
A question that often crops up in forums is how to disable su to certain users.
由于存在太多未知的因素，团队可能无法对某些用户描述作出评估。
There may be user stories that the team cannot estimate because there are too many unknowns.
对某些用户，必须登录才能使用他们的计算机确实是一个存在的问题。
For some users, having to log in to their computer is a real hassel.
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