Systems are built to meet certain stakeholder needs or goals; these define what the system is supposed to do.

系统被构建以满足一定的涉众需求或目标；这些定义了系统要做什么。

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When you are testing a SAP application, you first need to define the SAP system that SAP GUI client is connecting to.

当您开始测试一个SAP应用程序时，首先您需要定义一个SAP GUI客户端可以连接的SAP系统。

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If you cannot define the behavior of a system that runs well, how will you define the behavior of a system that doesn't?

如果不能定义运行良好的系统的行为，那么您如何能够定义运行不佳的系统的行为？

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They used a system of measurement called the Body Mass Index to define words like obese and overweight.

VOA: special.2009.07.21

Then, after you define what your system is, whatever is left over of the universe is the surroundings.

当你定义了你的系统后，宇宙的其余部分,就是环境。

麻省理工公开课 - 热力学与动力学课程节选

We're going to find other properties that do care about the history of the system like work, that you put in the system, or heat that you put in the system, or some other variables But you can't use those to define the equilibrium state.

我们还会发现其他一些,与系统的历史有关的性质,比如你对系统做的功，或者你向系统传递的热量，或其他的变量,但你不能用它们,来定义平衡态。

麻省理工公开课 - 热力学与动力学课程节选

What makes sense all depends on how you define the flow system involved.

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Microsoft needs to focus more on the video games that will define their system, and they really need to announce some non-Kinect exclusives for the Xbox One at E3.

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Responsibilities: Define and implement antenna system architecture to optimize the radiation performance for wireless portable devices.

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