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wǒmen jìnshí de shíhou ，kǒuqiāng nèibù huì shòudào cìjī ，dànǎo jiù huì xiàlìng fēnmì néng bāngzhù xiāohuà shíwù de tuòyè ，qízhōng yòu yǐ suān de shíwù suǒ chǎnshēng de cìjī zuìwéi qiángliè 。

When we are eating, we get oral stimulation. Our brain would command the mouth to secrete saliva in order to help digest the food. Among which, sour food induces the most stimulation.

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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.

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所以每次当我们吃进柠檬、梅子、酸菜等酸的食物的时候，大脑就会下达指令分泌大量的唾液。

suǒyǐ měicì dāng wǒmen chī jìn níngméng 、méizi 、suāncài děng suān de shíwù de shíhou ，dànǎo jiù huì xiàdá zhǐlìng fēnmì dàliàng de tuòyè 。

As a result, when we are eating lemon, plum, pickled cabbage or other sorts of sour food, our brain would give orders to secrete a big amount of saliva.

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