Although reservoirs themselves are inherently harmful in many ways, the real nub of today's lack of water is everyone's unhealthy attitude towards the resource. Hence, "however many mighty dams you build, they won't hold enough water."
雖然水庫本身確實有許多弊害，但大家對水的看法「不健康」才是今天水荒的癥結，如此，「有再多銅牆鐵壁打造的水庫也擋不到水源。」