What are the commonly used words of flat tongue and upturned tongue in primary schools?

Ancestors wrote Cao Cao's ci? ,? Roughly horizontal in the left book.

Tibetans miss mulberry silk, and if they hit the wrong bottle, they will throw acid.

How to smuggle goods three or four times, blame yourself for being eager to adopt policies.

Sun Suo has never been a temple sweeper, and Zou Caisu's village is as dirty as a treasure.

Although Cang Jie died at the age of six, I have guessed the uneven bamboo shoots and millet.

Choose the ear of grass quickly and complain about the injury. I have given a mixed meal of green onions and garlic.

Drill the umbrella seat plug again.

Extended data:

It refers to the confusion between Z, C, S and zh, ch, sh and R, which leads to incorrect pronunciation.

There are three kinds of flat tongue sounds: Z, C and S; There are four languages: zh, ch, sh, R.

The so-called flat tongue sound refers to the Z, C and S sounds when the tongue stretches horizontally and touches or approaches the back of the upper teeth. Twisted tongue refers to zh, ch, sh and R produced when the tip of the tongue is tilted, touching or approaching the anterior hard palate.

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