razor steel(For a razor a hard metal is needed which can be brought to an enduring sharp edge, and the razor steel contains over 1 per cent of carbon. 剃须刀需要使用高硬度钢制造,这样才能使刀刃保持长久锋利,因此剃须刀钢的含碳量应大于1%。)
plain carbon steel tool(Using such high-speed steel tools, metal parts can be machined many times faster than by the use of plain carbon steel tools. 使用这种高速钢刀具切削金属部件的速度比使用普通碳素钢刀具快许多倍。)
high-speed steel tool(Using such high-speed steel tools, metal parts can be machined many times faster than by the use of plain carbon steel tools. 使用这种高速钢刀具切削金属部件的速度比使用普通碳素钢刀具快许多倍。)