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| 大锅; 煮皂锅; 锅形陷坑; 煤层上下的直封印木化石 | |||
| 丘间洼地; 丘间低地 | |||
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cauldron : 12 phrases in 4 subjects |
| Agriculture | 2 |
| Engineering geology | 2 |
| Oil / petroleum | 3 |
| Technology | 5 |
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