After sending away the curious classmates, Zhao Yuan closed the dorm room door and said to his three friends, "Alright, guys, let's start training again. But this time, you have to hold it in. Don't yell so loudly. We attracted the dorm supervisor this time; who knows who we'll attract next."
Liu Zhu, Wang Rongfeng, and Wu Yan all grimaced. "We don't want to yell so loudly either," they said in unison, "but practicing this technique is just excruciating. We can't hold it in even if we try."
"I see..." Zhao Yuan's brow furrowed slightly, and he quickly came up with a solution. "I've got it! Each of you grab a book and bite down on it. When it gets painful, just bite harder. That way you won't make so much noise."
The three of them thought it over. Seeing no other option, they did as Zhao Yuan said, each grabbing a textbook to bite down on.
