The bent shaft to be discarded as useless due to not machining enough is processed into accepted product by the said method.

优点是对于因不够加工而要报废的曲轴，通过该方法加工成合格产品。

youdao

However, when connectivity and applications are used with mobile devices, the largely useless product becomes a product of services.

FORBES: The New Manufacturing Lifecycle: An Interview With PTC's Hepplemann

All the other scientists who had attempted this, including the glass experts at Corning, found that their concoctions were gelling too early, resulting in a useless product.

FORBES: The Science of Small

The Eaton Vance product carries a 2.25% front-end load, making it useless for a short-term investor.

FORBES: Fixed Income for Bears