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| function of urban ecological system | |||
| urban ecosystem Towns and cities viewed as ecosystems, having an input of matter and energy, recycling within the system, and an output of matter and energy into the surroundings (城镇和城市被视为生态系统，包括物质和能量的输入，在系统内循环，以及物质和能量输出到周围环境。) | |||
| urban ecosystem | |||
| urban ecological system | |||
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城市生态 系统 : 5 phrases in 2 subjects |
| Earth sciences | 1 |
| Technology | 4 |
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