A pseudoscientific oral training technique that claims that proper tongue posture — pressed firmly against the roof of the mouth — can reshape your jaw structure over time. The science doesn't back it up, but that hasn't slowed the spread of this odd practice.
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state = new_state，这一点在91视频中也有详细论述
He rushed back to the first door and, finding it locked, began pacing. After ten minutes, he came to a sudden halt. He pulled a piece of paper from his pocket, lowered his dust mask, stuffed the paper in his mouth, and chewed. He pulled another piece of paper from his wallet and chewed that, spitting the wad into a trash bin.