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| 小球根; 小球茎; 地下结球指块根，块茎作物 | |||
| 底碛层; 底积 (层) | |||
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| 底层 | |||
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bottom set : 7 phrases in 5 subjects |
| Agriculture | 1 |
| Desert science | 1 |
| Engineering geology | 1 |
| Technology | 3 |
| Textile industry | 1 |
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