Feng Qingxue explained, "Your top teeth grow downwards, so of course you have to throw them under the bed."
"What about the bottom teeth?" Xibao pried her mouth open and pointed to a row of her bottom teeth, "They grow upwards, so should I throw them up into the sky? That's so difficult; if you throw a clod of earth up it just falls back down."
Xibao furrowed her brow, a look of great consternation on her face.
Feng Qingxue couldn't help but laugh, "There's no need to throw them into the sky, just throw the fallen bottom teeth onto the roof."
After hearing this, Xibao glanced at the roof of her house, dashed into the room to throw the two big front teeth she was holding under the bed, then ran out and said to Feng Qingxue, "Mom, I've already thrown them under your bed. Will my teeth grow back tomorrow?"
So impatient?
Feng Qingxue shook her head, "I'm afraid not, the time is too short. You see, a seed sown in the ground doesn't sprout the next day either."