Reverse-osmosis (RO) and deionization (DI) are common water purification steps.

反渗透（RO）和去离子（DI）是通用的水纯化步骤。

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She studied communities like farmers in Southern California who depended on a common water supply.

她研究社区，如：南加利福尼亚的农民依赖共同的水源。

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Since nitrogen oxide compounds are components of smog and are common water pollutants, does nitrogen-enriched gasoline create additional pollution?

既然氮氧化物是烟尘成分的一种，也是常见的水污染物，那加氮汽油会不会产生额外的污染呢？

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The paddocks will need water. Some farmers design paths for animals from different paddocks to drink from a common watering place.

VOA: special.2010.01.19

The paddocks will need water. Some farmers design a path for animals from different paddocks to drink from a common watering place.

VOA: special.2009.01.06

She studied communities like farmers in Southern California who depended on a common water supply.

VOA: special.2009.10.16

The bacterium legionella pneumophila and related bacteria are common in natural water sources such as rivers, lakes and reservoirs, but usually in low numbers.

BBC: The water fountain at Northampton's market square

The bacteria are "remarkably common in the water and in the environment, " according to Dr. Buddy Creech, assistant professor of pediatric infectious diseases at Vanderbilt University.

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Dr. Buddy Creech, an assistant professor of pediatric infectious diseases at Vanderbilt University, said that Aeromonas hydrophila -- which is "remarkably common in the water and in the environment" -- is one of many bacteria that can cause a flesh-eating process.

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