表面变硬 meaning in Chinese
case hardening
Examples
- 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。 - 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。