To draw a guard on a sequence diagram in UML 1.x, you placed the guard element above the message line being guarded and in front of the message name.

UML 1 . x中，为了在一个序列图上画一个约束，你把约束元件放在约束的消息线上，消息名字之前。

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For example, in our applications, the standard error message will be displayed in the message line, just above the function key line in the lower part of screen.

例如，在我们的应用程序中，标准错误信息将显示在消息行中，正好在屏幕下部的功能键显示区之上。

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"It's very important that the message not be that we have raised the base line for spending.

VOA: standard.2009.03.10

So generally, if you don't get an error message in a command line environment like this, that's good.

一般来说，如果你在命令行界面,没有收到错误信息，那就是好消息。

哈佛公开课 - 计算机科学课程节选

But as I said, the bottom line message is that we feel the pain that all Americans feel on the price of gasoline today.

WHITEHOUSE: Press Briefing

When I called one of the researchers, Ells Dutton from the National Oceanic and Atmospheric Administration (Noaa), he described the top line message as "relatively mild".

BBC: More sulphur trails from the stratosphere

The top line message is that the increase in concentrations over the "noughties" has partially masked temperature rise - similar to the conclusion of the research released two weeks ago, but using a radically different line of inquiry.

BBC: More sulphur trails from the stratosphere