Suddenly, a red warning light turned on.

突然，一个红色警告灯亮了。

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This example demonstrates turning on a red warning light if the build fails.

这个例子演示了在构建失败时，打开一盏红色的警示灯。

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Imagine that you are driving in your car and the red warning light comes on.

假如你在开车的时候，红色警示灯突然亮了起来。

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They say this is because the red warning lights aren't visible in fog or low cloud.

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The Met Office issued a rare red warning warning of snow and blizzards on Thursday.

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When swimming, watch out for the red warning flags or ask a lifeguard as the waves can be harsh.

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