The researchers pointed out that low-frequency processes, such as fluctuations instream flow and groundwater levels, would not usually be apparent to human populations.
研究人员指出,低频过程诸如河流流量和地下水水位的波动,通常不会对人类产生明显影响。
2
Groundwater commonly collects instream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions.