这些膜技术本质上都是一个过滤程序，就是用一个有非常细小水通道的膜片把污染物离子从溶液里过滤掉。
Each of the membrane technologies is essentially a filtration process in which contaminant ions are filtered from solution using a membrane with very small water passages.
放射性的烟雾会附着在农作物上……火灾甚至能在150公里开外对食物产生这种辐射浓聚物以至不利于食用。
Radioactive smoke landing on crops... even 150km or more from the fire can create such concentrations of radiation in food it will be harmful to eat.
研究者们也检查了从沉没岛屿里采集的沉淀物样本发现了花粉和碳，表明岛屿上曾经有过植物生长。
The researchers also examined sediment samples from the sunken world and found traces of pollen and coal, suggesting land plants once resided there.
应用推荐