Sulfur dioxide, a major contributor to acid rain, is an especially serious pollutant because it diminishes the respiratory system's ability to deal with all other pollutants.

二氧化硫是酸雨的主要成因之一，它是一种特别严重的污染物，因为它会降低呼吸系统处理其他污染物的能力。

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Among them, wastewater problem is especially serious.

其中，废水问题尤为严重。

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Being involved in other especially serious circumstances.

有其他特别严重情节的。

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He says child labor is an especially serious problem in West African countries.

VOA: special.2009.06.08

The problem is especially serious in Asia and the Pacific.

VOA: special.2010.04.05

The risks are especially serious for young people with certain conditions including heart problems, seizures, diabetes, and even behavioral problems and mood disorders.

FORBES: As Caffeinated Gum Hits The Shelves, FDA Jumps To Attention

The financial threat is especially serious for Graciela Bevacqua, who lost her job as head of INDEC in 2007 for refusing to tamper with the price index.

ECONOMIST: Stalinist practices in Buenos Aires

At one point, Pfizer presented data about an injectable pain drug that has not yet been approved by the FDA, due partly to especially serious concerns about heart risk.

FORBES: Pfizer And Merck Face The Jury