 |
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| 平均次数 | |||
| 平均时间 | |||
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averaging time : 13 phrases in 7 subjects |
| Chemistry | 1 |
| Earth sciences | 1 |
| Oil / petroleum | 1 |
| Refrigeration | 1 |
| Space | 1 |
| Technology | 5 |
| Wind Energy | 3 |
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