如果比月的值小，当前月份值会高亮显示为红色，而大于或等于，则高亮显示为绿色。
Current month values that are less than those of the previous month are highlighted in red, and those that are greater than or equal are highlighted in green.
在图5中，由于复杂的公式导致超过80个字符，所以Vim用红色高亮显示一整行。
Since we exceeded 80 characters thanks to the complex formula, in Figure 5, Vim highlights the whole line in red.
在图3中，用红色高亮显示repeat后面的制表符；这明确地警告用户这里有错误。
In Figure 3, the TAB just after repeat is highlighted in red; a clear flag to the user that something is wrong.
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