指南1.4可辨别的：使用户更容易看到和听到内容，包括区分前景色和背景色。

Guideline 1.4 Distinguishable: Make it easier for users to see and hear content including separating foreground from background.

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如果对队列中所有单音调的比较结果超过音调偏差的最大值，则指定当前处理不生成可辨别的音调。

If the comparison to any single tone in the queue exceeds the maximum tonal deviation, specify that the current processing did not produce a discernable tone.

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完全性失语是失语症中最严重的类型。 患者仅能说出极少可辨别的词，极少或根本不理解别人的话。

Mixed non-fluent aphasia is applied to patients who have sparse and effortful speech, resembling severe Broca's aphasia.

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