There were hidden reserves in the voice.

声音里隐藏着含蓄。

After spending a lifetime studying people and their hidden reserves of power, the great psychologist, Alfred Adler, declared that one of the wonder-filled characteristics of human beings is " their power to turn a minus into a plus" .

伟大的心理学家阿尔弗雷德·阿德勒 (Alfred Adler) 花了一生的时间研究人及其隐藏的力量储备后，宣称人类充满奇迹的特征之一是“他们有能力将负数变成正数”。