点选预览，这样你就能看到设置数值时的效果，如果需要可调整数值。

Check on Preview so you are able to see the end results from the Settings. Adjust the values if necessary.

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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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赋值转换将一个常数值设置到目标属性。

An assign transform sets a constant value to a target attribute.

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