It can be washed out when it rains or it can be released to the atmosphere, whereas phosphorus combines with calcium and iron, and can be preserved in the soil for thousands of years.

它可以在下雨时被冲刷掉，也可以释放到大气中，而磷与钙和铁结合，可以在土壤中保存数千年。

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Hydrogen combines with oxygen to form water.

氢与氧化合成水。

《牛津词典》

You burn methane, and it combines with oxygen to form water, to form CO2.

燃烧酒精，酒精分子和氧气结合形成水和二氧化碳。

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Cold weather moves south and combines with the last of the warm air from summer.

VOA: special.2009.06.09

You burn methane, and it combines with oxygen to form water, to form CO2.

燃烧酒精，酒精分子和氧气结合形成水和二氧化碳。

麻省理工公开课 - 热力学与动力学课程节选

The whites," He said, "Of the South, form a veritable aristocracy which combines many prejudices with high sentiments and instincts."

他说道,"南方的白种人,是名副其实的贵族,他们对许多事物存有偏见,这些偏见中包含他们强烈的情感与天性"

耶鲁公开课 - 美国内战与重建课程节选

But the increase combines with falling donations mean many report that their shelves are becoming bare.

BBC: Charities to get recession funds

The second trend, social combines with mobile to change how businesses engage with its customers and employees.

FORBES: Three trends that change business: Mobile, Social and Cloud

His techie edge combines with physical and behavioral differences to set him apart from Mickey, Spector says.

CNN: Meet Oswald, Mickey's lucky, techie 'big brother'