At present, the technical parameters and the wear rate of the retaining ring are confirmed through trial or experience, which usually has longer periods, higher cost and larger waste.

目前关于保持环工艺参数和磨损率的确定都是依靠反复的试验或经验确定，周期长，成本高，浪费大。

youdao

The wearing tests of the knitted acrylic fabric of self-twist and ring spinning yarn is conducted by means of the wear testing instrument, the wear trial and the scanning election microscope.

本文介绍了用耐磨仪、试穿和扫描电镜三种试验手段，对自捻纱和环锭纱腈纶针织物所作的耐磨性能测试情况。

youdao

Ring was convicted at his second trial (first one failed to reach a verdict) in November 2010.

FORBES: Kevin Ring, Abramoff Understudy, Sentenced to 20 Months In Prison

The alleged head of a multi-billion dollar smuggling ring in south-east China has confessed and now faces trial, Chinese state media say.

BBC: China