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| observation data | |||
| observational data; observed data | |||
| observational material | |||
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观测 资 料 : 17 phrases in 6 subjects |
| Bridge construction | 2 |
| Desert science | 2 |
| Earth sciences | 4 |
| Engineering geology | 1 |
| Remote sensing | 1 |
| Technology | 7 |
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