现在让我们实现更复杂的目标并添加一些有条件的文本呈现—例如，命名偶数和奇数表行的css类。

Let's make the goal more complex and add some conditional text rendering - for example, CSS class names for even and odd table rows.

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用不同的颜色显示奇数行和偶数行，这样读者更容易阅读。

By alternating colors on even and odd rows, it makes the list easier to scan.

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特别地，他们证明了在平均的意义上，各位数字和是偶数的素数跟数字和是奇数的素数一样多。

In particular, they have demonstrated that, on average, there are as many prime Numbers for which the sum of decimal digits is even as prime Numbers for which it is odd.

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