钠缺乏会影响大脑活动，所以水中毒的早期症状包括易怒、嗜睡等其他精神上的变化。
Losing sodium can affect brain activity, so early symptoms of water intoxication can include irritability, drowsiness and other mental changes.
对冶炼中有害元素钾、钠、氟、硫的控制还缺乏有效手段，致使出现高炉利用系数偏低、高炉不畅和造成环境的严重污染。
Control on harmful elements such as K, Na, f, s in smelting is short of effective measures, which results in BF capacity factor low, BF process not smoothly and serious environment pollution.
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