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| performance degradation | |||
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性能老化 : 14 phrases in 9 subjects |
| Animal husbandry | 1 |
| Architecture | 1 |
| Electric machinery | 2 |
| Metallurgy | 1 |
| Plastics | 1 |
| Polymers | 1 |
| Space | 1 |
| Technology | 5 |
| Textile industry | 1 |
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