hard·en·ing 
(härdn-ĭng)
(härdn-ĭng)n.
1. The act or process of becoming hard or harder.
2. Something that hardens, as a substance added to iron to yield steel.
3. Gradual exposure of plants to cold weather.
| 单词 | hardening |
| 释义 | hard·en·ing (härdn-ĭng)n. 1. The act or process of becoming hard or harder. 2. Something that hardens, as a substance added to iron to yield steel. 3. Gradual exposure of plants to cold weather. |
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