Changing the timeout for system lock seems like easy, and useful functionality.

改变系统锁定的延迟时间似乎是很简单而且很有用的功能。

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Changing the account Settings without the users' knowledge would have let the perpetrators forward copies of all the messages in the account to their own system undetected.

在用户不知情的情况下更改账户设置，入侵者就可以将这个账户中的所有邮件转发到自己的系统中，而不被察觉。

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Let's consider the pluses and minuses of changing the system.

我们来考虑一下改变系统的利弊吧。

《牛津词典》

So, these on-changing properties that describe the state of the equilibrium state of the system are called state variables.

这些描述,系统平衡态的,变化的属性,就叫做状态变量。

麻省理工公开课 - 热力学与动力学课程节选

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