而后通过排水管进入水库，再从那儿运送到水处理厂，经过净化，最终达到饮用水标准。
Before being taken by drains to reservoirs, and thence to treatment plants where it is cleaned to drinking-water standards.
而后通过排水管进入水库，再从那儿运送到水处理厂，经过净化，最终达到饮用水标准。
Before being taken by drains to reservoirs, and thence to treatment plants where it is cleaned to drinking-water standards.
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