中文摘要：

单独使用1方声调符号的标调方式使得现行盲文无法兼顾表音准确性与简洁性，声调与篇幅同时增加是现行盲文推广60年来一直未解决好的问题。隐性标调作为一种不占方的标调方式，为解决现行盲文的先天缺陷和盲文共性之间的矛盾提供了新的可能。隐性标调主要包括唯一声调类、唯一常用声调类、高频类。隐性标调的首位原则是准确性原则，其次是稳定性和易读性原则。隐性标调可以使现行盲文脱离“一形多调”的低级形态，跻身世界先进盲文之列。

英文摘要：

The one-cell tone indication makes it impossible for the currently-used Chinese Braille to be beth precise and concise, and the simultaneous increase of tones and length remains a problem unsettled in the past 6 decades. Hidden tones, a non-cell tone indication, make it possible to eliminate the congenital defects of the existing Chinese Braille and the common contradictions of any type of Braille. Hidden tones include three main categories： the sole tone, the sole commonly-used tone, and the high-frequency tone. The first principle of hidden tones is precision, followed by constancy and readability. Hidden tones can help the existing Chinese Braille to break away from ＂one form with more tones＂, and become an advanced type of Braille in the world.