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| quarry gravel; raw gravel; shingle-stone; gravel; ballast | |||
| coarse gravel | |||
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| coarse gravel | |||
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粗砾石 : 12 phrases in 5 subjects |
| Architecture | 1 |
| Earth sciences | 1 |
| Geology | 1 |
| Hydroelectric power stations | 1 |
| Technology | 8 |
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