A father and son lived on a mountain, and every day they would drive an ox cart down the mountain to sell firewood. The father, being more experienced, would take charge of driving the cart. The mountain road was rugged with many winding turns. The son, with his better eyesight, would always alert at the turns by shouting: "Dad, it's time to turn!"
One day, the father was unable to go down the mountain due to illness, so the son drove the cart alone. When they reached a bend in the road, no matter what the son did, the ox wouldn't turn. He tried everything - getting out of the cart to push and pull, even tempting the ox with fresh grass - but the ox remained still.
Puzzled over this situation and after much thought, he finally found only one solution. Looking around and seeing no one, he leaned close to the ox's ear and shouted loudly: "Dad, it's time to turn!" Upon hearing this, the ox moved immediately, as if understanding the command forevermore.
(Note: The phrases like "网布椅", "曲木椅", "会议椅", and "永远的坐票" seem unrelated or possibly incorrectly inserted in the original Chinese text, thus they are not included in the translated story.)