在线与实时
在线和实时有什么区别？是 OnLine = RealTime，但是 RealTime != Online，否则呢？
谢谢。
What is the different between OnLine and RealTime? Is OnLine = RealTime, but RealTime != Online, or else?
thank you.
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在线意味着涉及某种交互性，但不强制限制延迟。
实时意味着延迟是有限制的。
如果您移动计算机的鼠标，您希望指针立即做出反应并精确地跟随您的操作。这是实时的。另一个例子是在音乐键盘控制器上演奏并使用一些生成声音的合成器程序。
然而，在网上，你的行为会及时地显示出一些反应，但并没有强制执行及时的关系。例如，从（远程控制的）网络摄像头启动视频流可能会以不到 1 秒的延迟甚至长达几分钟的延迟向您显示图片，但仍处于在线状态。
Online means that there is some kind of interactivity involved, but doesn't enforce limits in latency.
Real-time means that there are limits on latency.
If you move your computer's mouse, you expect the pointer to react immediately and precisely follow your actions. That's real-time. Another example is playing on a music keyboard controller and having some synthesizer program that generates the sounds.
Online, however, is such that your actions show some response in some timely manner, but there's no timely relationship enforced to it. For example, starting a video stream from a (remotely controllable) webcam may show you the pictures with less than 1-second latency, or even up to several minutes, yet be online.
实时：
在线具有更广泛的含义，需要上下文才能正确理解。一般情况下，它是“可操作的”或“交互式的”。
real-time:
Online has a broader meaning and requires a context to be understood correctly. In general case, it's "operational" or "interactive."