模型在以下位置定义安全设置。

The model defines security at the following locations.

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命名查询使您能够在单个位置定义一个查询。

Named queries enable you to define a query in a single location. There are many benefits to named queries.

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在样式表或其他位置定义的全局变量或参数。

A global variable or parameter, defined once in the stylesheet and available everywhere.

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And when we're talking about the amplitude of the wave, we're talking about the deviation from that average level. So, if we define the average level as zero, you can have either a positive amplitude or a negative amplitude.

当我们讨论一个波的振幅时,我们说的是偏离平均位置的量,如果我们把平均位置,定义为零的话，那幅值不是,正的就是负的，有时候人们在。

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