单词non-friction
网络: 摩擦力
This valve has a series of advantage, such as non-friction, the adjusting of pressure and labor-saving when it switches .
该球阀具有启闭无磨损，关闭时压力可调节和启闭省力的优点；
The Market Competition Strategy in the Days of Non-Friction Economy and the Internet
非摩擦经济与网络时代市场竞争策略