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| |||
| 平均停留时期 | |||
| 平均停留时间 | |||
| 平均滞留时间 | |||
| 平均保留时间 | |||
| 平均残留期 | |||
| mean residence time: 5 phrases in 3 subjects |
| Earth sciences | 3 |
| Metallurgy | 1 |
| Technology | 1 |
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