Sometimes, you might prefer to use color to represent some functional meaning without providing a text equivalent.

有时，你宁愿使用颜色而不是意思相同的文字来表示某些功能性含义。

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Then, in subsequent test runs, a human tester will not need to look at the text equivalent again unless the image or the text has changed since the last test run.

然后，在后继的测试运行中，测试人员将不需要再观察文本等价物了，除非从最近一次测试运行开始图像或文本改变了。

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For example, a machine can test whether a text equivalent is available for an image, but it cannot test the quality of the text or even determine whether the text is meaningless filler.

例如，计算机可以测试文本等价物对图像是否可用，但不能测试文本的质量或者甚至确定文本是否是无意义补白。

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Sending or receiving a text takes a driver's eyes from the road for an average of 4.6 seconds, the equivalent of driving the length of an entire football field, blind, at 55 mph, according to researchers at the Virginia Tech Transportation Institute.

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