前震活动在时—空图形上分别形成“时—空”弯形平静区。
There was a bay-shaped quiet area of foreshocks for main shocks in a time-space diagram.
内容的图形不是很有趣，并且它通常只是一个空面板，该面板将包含图的子图。
The content's figure is not too interesting, and is often just an empty panel that will contain the diagram's children.
开始设计一个简单的图形库：要这样做，您需要利用NewUMLProject向导(图1)在新的UML工程中创建空的模型。
Start by designing a simple graphics library: To do this, create an empty model in a new UML project by using by the new UML project wizard (Figure 1).
开始，图形化编辑器的画布是空的。
用于子文件夹的media - type属性是空的(例如我示例中的Pictures文件夹)，但通常会在这些子文件夹中包含任何嵌入图形的图形源文件。
The media-type attribute for subfolders is left empty, such as that for the pictures folder, which is empty in my example, but normally contains the graphic source files for any embedded pictures.
将这个方法应用到ST_Envelope(对于任何非空的几何图形，它总是返回一个多边形)的结果上将得到我们需要的那个点。
Applying this method on the result of ST_Envelope, which always returns a polygon for any non-empty geometry, gives us the single point we need.
将这个方法应用到ST_Envelope(对于任何非空的几何图形，它总是返回一个多边形)的结果上将得到我们需要的那个点。
Applying this method on the result of ST_Envelope, which always returns a polygon for any non-empty geometry, gives us the single point we need.
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