时间一久,就算还没尝到酸的食物,光是想像,大脑也会习惯性地发出信号让口腔内部分泌唾液。
shíjiān yī jiǔ ,jiùsuàn hái méi cháng dào suān de shíwù ,guāngshì xiǎngxiàng ,dànǎo yě huì xíguànxìng de fāchū xìnhào ràng kǒuqiāng nèibù fēnmì tuòyè 。
As time passes by, even though we haven't eaten sour food yet, our brain would customarily send signals to make our mouth secrete saliva by simply imagining sour food.