您可以设置单元格格式根据您指定的条件而改变。
You can set up cell formats to change depending on conditions that you specify.
接着要做的事情是添加第二个规则，设置数值小于80的单元格格式，格式为“自动”（默认主题里是透明单元格里的黑色文本）。
The next thing to do is to add a second rule that formats values that are less than 80, and set the format to "Automatic" (black text on transparent cells for the default theme).
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