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| 群体压力; 种群压力 | |||
| 人口增长对环境造成的人口压力 | |||
| 人口过剩的压力 | |||
| 人口压力 | |||
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population pressure : 6 phrases in 3 subjects |
| Agriculture | 2 |
| Earth sciences | 1 |
| Economy | 3 |
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