Gear must be properly lubricated.齿轮必须适当地加油润滑.The interacting surfaces were lubricated with a mineral oil.相互作用表面是用矿物油润滑的.One mode is slippage along the discontinuity provided by the lubricated fault plane.其中一种方式是沿着润滑的断层面所...
He skirted the hardest issues, concentrating on areas of possible agreement.他避开了最棘手的问题，将精力集中于有可能达成一致的领域。Many firms are concentrating on increasing their markets overseas.许多公司正在集中精力开拓它们的海外市场.The audience is all concentrat...