Volatile (Volatile Acidity; VA) : Describes an excessive and undesirable amount of acidity, which gives a wine a slightly sour, vinegary edge. At very low levels (0.1 percent), it is largely undetectable; at higher levels it is considered a major defect.

挥发物（挥发酸；VA）：形容过多的，令人不悦的酸度，使酒有轻微酸败味。极低的水平下（1‰）是很难察觉的；水平高了可认为是酒的主要缺陷。