As the name implies, the tongue is placed behind the gum, gently leaning on it, and slightly lifting when pronouncing, so that the air can pass through this position. Don't roll your tongue too hard, it will sound a little Lickitung. Remember that the airflow should pass through this position, and don't die with your tongue behind your gums!

Extended data:

Pronunciation position and method

zh

Do not inhale behind the tip of the tongue, and clear the fricative sound.

When pronouncing, the tip of the tongue tilts upward, close to the front of the hard palate, the soft arm rises, blocking the nasal passage, and the vocal cords do not vibrate. The weak airflow pushes the obstruction on the tip of the tongue through the narrow gap and squeezes it out, rubbing it into sound. For example:

Monosyllabic: Zhao, Zheng, Zhi, Zhong, Zhu, Zhuan, Zhuang, Zhou, Chong, Grasp, Chase and Pick.

Two syllables: solemnity, proposition, pillar, turning point, pointer, war, politics, struggle, solemnity, paper, invitation to stop and flaunt.

Multi-syllable: Your eye, tricks, eloquence, striving for the first place, perfection, solemnity, knowing the law and breaking the law, knowing everything, being close at hand, being supreme and extremely wise.

Lord of honor

After the tip of the tongue, breathe and clear the fricative sound.

Compared with zh, the pronunciation is the same except for the strong airflow. For example:

Monosyllabic: health, noise, car, Chen, cheng, chong, Chu, boat, blowing, spring, stop, chuai, bed, smoke.

Disyllabic: overproduction, Great Wall, shipyard, interpolation, lathe, production, advantage, ride, demolition, heavy, early spring eradication.

Multi-syllables: give inferences by analogy, be long-winded, speak freely, be trite, be taciturn, be outspoken when successful, be beautiful as an adult, know well, connect the preceding with the following, work hard, be loyal, be arrogant, snatch food from the jaws, and pull a long face.

hush

After the tip of the tongue, it is clear and fricative.

When pronouncing, the tip of the tongue tilts upward, close to the front of the hard palate, forming a narrow gap, the soft palate rises, blocking the nasal passage, and the vocal cords do not vibrate. Air flows out from the narrow gap between the tip of the tongue and the front of the hard palate and rubs into sound. For example:

Monosyllabic: sand, snake, sieve, province, double, book, health, climbing, smoothness, mountain, water, afternoon, appreciation and poetry.

Disyllabic: scenery, hands, flashing, sacred, sand, gentleman, surgery, appreciation, examination, minority, facilities, boiling water, mountain climbing, accident, jewelry.

Multi-syllables: deeply rooted in people's hearts, full of energy, worth a hundred times, seeking truth from facts, unprecedented, always puzzled, consistent, Xanadu, twice the result with half the effort, artificial, counterproductive, sweeping.

References:

Examples of Phonetic Methods of Pingqiao Initial in Putonghua Learning Network