1. A week later a strap comes right apart making the shoes unwearable. 一个星期后一根鞋带断了，鞋子不能穿了。
2. What once looked unwearable now seems ordinary, and what once seemed banal now looks right. 曾经似乎老套的衣服，现在看来很合适。
3. The main invalidity of the refiner disc plate is the rounding of the bar edge in case of the plate has lower material rigidity and unwearable quality. 材料硬度低、耐磨性差的盘磨机磨片失效的主要形式是磨刀前对钝化磨圆，进而导致磨片剪切能力急剧下降。
