The results show that the pre-hardened plastic-mould steel belongs to a little low machinability steel because of much hard inclusion existing in microstructure and its high strength and hardness.

结果表明，这类材料属较难加工材料，这主要是由于钢中存在大量硬质点，且材料具有较高强度和硬度所致。

youdao

The types and characteristics of the tools for machining the pre - hardened mould steel are introduced in this paper. The application and developing trend of these tools are discussed.

论述了适应于加工这种材料的刀具的种类和特点，以及国外应用情况和发展趋势。

youdao

Mr Prescott's bruising experience has taught him a hard lesson: that pre-election de-centralisation rhetoric does not impress battle-hardened Whitehall mandarins, who instinctively resist any attempt to encroach on their territory.

ECONOMIST: Regional development: Whitehall rules | The