It expounds the important sense of tribology design of mining machinery to increase commercial efficiency, mechanical reliability and mechanical life.
阐述了矿山机械摩擦学设计对于提高经济效益、机械可靠性以及延长机械寿命的重要意义。
2
For the mechanicalefficiency of gold is, per se its ratio to the credit built on it.
因为从根本上来说，黄金的力学效率取决于黄金与以黄金为基础的信贷之间的比例。
3
W: We ask for full payment at sight, because we guarantee 90% mechanicalefficiency for all our products. You don't have the same guarantee from other suppliers. The usual percentage is around 85.