这种新型材料表面非常光滑，几乎不会产生摩擦阻力。

This new material has a ___low-friction surface that almost eliminates resistance.

新的客户服务系统采用低摩擦设计，让投诉处理更加顺畅。

The new customer service system uses a ___low-friction design to make complaint handling smoother.