Combined with the still widespread use of coal burners to heat homes, China has the world's highest emissions of sulphur dioxide and a quarter of the country endures acid rain.
加上家庭供暖普遍使用煤炉，中国有着世界最高的二氧化硫排放量并且国内四分之一地区遭受酸雨侵害。
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The chemical contents in the sand quartz has reached national standards of silicon raw material for plate glass production after combined treating by magnetic separation plus diluted acid dipping.
The acetogenic bacteria directly convert all of the carbon in sugar into acetic acid, which is then combined with hydrogen to produce ethanol without the carbon losses, the firm claims.