表面变硬的英文

• case hardening

• 表面:    surface; superficies; bounda ...
• 变硬:    harden; brinelling
• 表面变暗:    surface darkening; tarnishing
• 表面变化:    superficial alteration
• 表面变坏:    surface deterioration

例句与用法

1. Boldwood was listlessly noting how the frost had hardened the surface of the snow .
   博尔德伍德心不在焉地看着冰凌怎样使雪地的表面变硬。
2. Goodyear put his idea to the test , and saw that it did have more or less the desired effect , but only on the outside of the rubber
   固特异把这一设想付诸试验，但并没有达到预想的结果，只是在橡胶的表面变硬了。