生态系统模型一般参数较多，且在应用时存在时空尺度问题，易产生不确定性。
There are many parameters in the ecosystem model. The variability of parameters at different space-time scales resulted in uncertainties.
生态系统模型一般参数较多，且在应用时存在时空尺度问题，易产生不确定性。
There are many parameters in the ecosystem model. The variability of parameters at different space-time scales resulted in uncertainties.
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