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| 有用时间; 使用寿命; 使用年限 | |||
| 有效寿命 | |||
| useful time: 7 phrases in 7 subjects |
| Agriculture | 1 |
| Aviation | 1 |
| Communications | 1 |
| Electronics | 1 |
| General | 1 |
| Mining | 1 |
| Space | 1 |
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