Having a pH below 7, turning litmus red

• Able to neutralize bases or donate protons

pH 小于 7，使石蕊试纸变红

• 能中和碱或提供质子

Having a sour or tart taste

• Sharp or biting on the palate

味道酸或带酸涩

• 在口感上尖锐或刺激

Of igneous rock, rich in silica; opposed to basic

• High quartz and feldspar content

指火成岩，二氧化硅含量高；与基性相对

• 石英和长石含量高

Harsh, biting, or sharply critical in tone or style

语气尖刻、辛辣或强烈批评的