我们已经失去了对一桩耗时长久、不能速成的大型工件，不停地削凿、削凿、削凿的能力。

We've lost the ability to keep chipping away, chipping away, chipping away at a large task that's going to take time and can't be speeded up.

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因此，对衬板材质的要求是：既要求具有很高的表面硬度，以抵抗矿石的凿削与切削，又要求具有很高的强度与韧性，以抵抗冲击载荷。

Therefore, the liner materials should be required to have both very high surface to resist the drilling and cutting of ore and very high strength and toughness to resist impact Lord.

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认为其机制主要是：凿削式磨粒磨损和疲劳磨损。

It is concluded that the mechanisms include gouging abrasion and fatigue wear.

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