But the combination of a rising pollution load and falling water levels makes that process much harder.
但是不断增长的污染量和下降的水位组合是那些步骤变得更难了。
The severe air pollution alarms humans of the heavy load we have exerted on Earth by our insatiable production and usage of automobiles.
严重的空气污染警告人类，我们无休止的的生产和使用汽车给我们的地球带来了沉重的负荷。
The pollution of runoff more serious waterlogging disasters will be formed when the load exceeds the maximum runoff drainage time.
径流的污染情况比较严重，当径流量超过排水管网的最大负荷时就会形成内涝灾害。
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