If color is used to represent a specific meaning, visually impaired users or users with a system in high contrast mode will be unable identify the message conveyed by the colors alone.

如果用颜色来表示特定的含义，视力受损的用户或使用高对比模式系统的用户就无法了解只通过颜色传达的信息。

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In normal mode, the TAB will be highlighted when active, but if the system is set to high contrast mode, there is no way to identify which TAB page is active.

普通模式下，选项卡活动时会高亮显示，但如果系统设置为高对比模式，则无法确定哪个选项卡页是活动的。

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Also, it is quite intensive to run UPDATE STATISTICS in the high mode ina production system that runs continually.

而且，在连续运行的生成系统中，以high模式运行UPDATE STATISTICS显得过于密集。

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