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| 自然时效老化 | |||
| 自然时效 (【技】将钢材或工件在室温下长期停留并产生组织和性能变化的过程，可用于大型铸件以消除铸造应力。); 常温时效; 自然陈化 | |||
| 自然老化［时效］ | |||
| 天然时效; 自然老化 | |||
| natural ageing: 1 phrase in 1 subject |
| Metallurgy | 1 |
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