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| permafrost ecosystem The interacting system of the biological communities and their nonliving environmental surroundings in a climatic region where the subsoil is perennially frozen (生物社区与它们周围的无生命环境互动的系统，底部土壤四季不断结冰的气候区域。) | |||
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冻土 生 态系统 : 2 phrases in 2 subjects |
| Desert science | 1 |
| Technology | 1 |
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