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| 第一性生产力｛农红｝ | |||
| 初级生产力 | |||
| 第一性生产力 | |||
| 初级的生产力 | |||
| 初级生产能力 | |||
| primary productivity: 9 phrases in 5 subjects |
| Agriculture | 1 |
| Animal husbandry | 1 |
| Desert science | 4 |
| Earth sciences | 2 |
| Technology | 1 |
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