The arsenic concentration of this well water was 0.6rag/L, which was 15 times as great as the maximal permissible concentration of drinking water, In the plant the morbidity of endemic chronic arseni cism was 44.6 percent.是什么意思_The arsenic concentration of this well water was 0.6rag/L, which was 15 times as great as the maximal permissible concentration of drinking water, In the plant the morbidity of endemic chronic arseni cism was 44.6 percent.在线翻译_英语_读音_用法_例句