In the first step in this process we pressurize the water and pass it through a reverse osmosis membrane: a thin, permeable plastic membrane that allows water molecules to pass through but traps and retains the salts, the viruses and the organic chemicals that might be present in the wastewater.
第一步是给水加压， 让它通过反向渗透膜 ——一种很薄的、可渗透的塑料膜—— 水分子可以通过， 但废水中可能含有的盐、病毒和有机化学物 会被拦截下来。