acidification
  使發酸,酸化,成酸性
  acid·i·fi·ca·tion /-fəˈkeʃən/ 名詞
  酸化(作用),酸化,加酸
  A·cid·i·fi·ca·tion n.  The act or process of acidifying, or changing into an acid.
  ◄ ►
  acidification
       n : the process of becoming acid or being converted into an acid