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| 红色岩层 | |||
| 红层 | |||
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| 红层; 红色岩层 | |||
| 红砂岩层 | |||
| red beds: 9 phrases in 4 subjects |
| Desert science | 1 |
| Earth sciences | 1 |
| Hydroelectric power stations | 1 |
| Technology | 6 |
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