但因为它全是数字化的，它消除了二手书市场，也消除了任何共享，而且因为作业和考试都是通过准入码进行的，它消除了任何选择退出的能力。
But because it's all digital, it eliminates the used book market and eliminates any sharing, and because homework and tests are through an access code, it eliminates any ability to opt out.
因为它全是数字化的，它淘汰了二手书市场，也杜绝了任何共享，而且因为作业和考试都是通过准入码进行的，它让人们失去了选择退出的任何能力。
Because it's all digital, it eliminates the used book market and eliminates any sharing, and because homework and tests are through an access code, it eliminates any ability to opt out.
首先，它几乎没有任何动态内容 —只有用户名和登录/退出链接。
First, there is almost nothing dynamic about it anymore — just the user name and login/logout link.
在Windows和Linux 中，等待函数会挂起当前进程的执行，直到它完成等待，不过，在 Windows中可以选择在指定的时间后退出。
Wait functions, in both Windows and Linux, suspend the execution of the current process until it completes, but in Windows there is an option to exit by specifying a time value.
在现代民法中，物权行为无因性原则已经失去了它的历史基础和法律基础，应当退出历史舞台。
In modern civil law, the doctrine of Abstraktionsprinzip has lost its historical and legal foundation it used to have, and should quit the historical arena.
如何把它和系统退出代码区别开来仍旧是个问题。
Still, how to reliably differentiate this from application exit code and output?
直升机自转进入和退出是直升机机动飞行经常遇到的状态，它的特性是由直升机旋翼和发动机的安装特性共同决定的，该状态的发动机控制是典型的直升机与发动机的综合控制。
It is a characteristic of the helicopter rotor and its engine installation, and the engine control in this condition is a typical integration control of the helicopter and the engine.
直升机自转进入和退出是直升机机动飞行经常遇到的状态，它的特性是由直升机旋翼和发动机的安装特性共同决定的，该状态的发动机控制是典型的直升机与发动机的综合控制。
It is a characteristic of the helicopter rotor and its engine installation, and the engine control in this condition is a typical integration control of the helicopter and the engine.
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