A research official said 1998 figures were used because the year marked the highest level of sulfur oxide emissions in China.
一位研究官员解释到,因为1998年是中国硫化物释放含量最高的一年,因此这一年的数字被用来研究。
The negative C-type retardation compensator for the liquid crystal display includes polyarylate having a thio group or a sulfur oxide group in a polymer main chain thereof.