According to his research, it takes a peak tensile strength of 28 kg to stop shoes from tearing apart in a sudden incident, so that if you're on an outing, for example, and your shoe gets stuck in the mud, you don't have to worry about the shoe's uppers separating from the soles.
根據他的研究，瞬間拉拔力要達 28 公斤，才能防止鞋子在突發狀況時斷裂，類似出遊時拖鞋陷在濕地爛泥中、鞋耳和鞋面分家的糗況才不會發生。