The second level consists of the performance counter, which is an attribute of the performance object.

第二级包括性能计数器，它是性能对象的属性。

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The status attribute in the <g:each> tag is a simple counter field. (Notice this value is used on the next line in a ternary statement that sets the CSS style to either even or odd.)

<g:each> 标记的 status 属性是个简单的计数器字段（请注意这个值用在下一行的 ternary 语句中，用来将 CSS 样式设为 even 或 odd）。

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This text introduced the concept of the classification counter of attribute value, then introduced ID4 algorithm and ID5R algorithm especially, and compare at the end.

该文引入了属性值类别计数器的概念，然后重点介绍了ID4算法和ID5R算法，并在最后加以比较。

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