Due to the uncertainties in the climate change impact assessment, current forecasts for the futurevariation trend of runoff in the Yellow River Basin are inconsistent.
由于气候变化影响评价中存在的不确定性，目前对黄河流域未来径流变化趋势的预测并不一致。
2
Synergistic effects, nonlinear variation, and difficulties in discounting the future make the intellectual problem difficult, but not (in principle) insoluble.
这项智力难题因协同作用，非线性变化，和考虑将来而变得困难，但(原则上)不是不可能解决。
3
But it warned that, given the likely strong seasonal variation in attendance, it was not possible to predict future attendance or profits.