de·te·ri·o·ra·tion /dɪˌtɪriəˈreʃən, di-/
  惡化,降低,退化
  de·te·ri·o·ra·tion /dɪˌtɪrɪəˈreʃən/ 名詞
  劣化,變質,變壞,損耗,損壞,惡化,退化,衰退,頹廢,微生物致變質,腐化
  De·te·ri·o·ra·tion n.  The process of growing worse, or the state of having grown worse.
  ◄ ►
  deterioration
       n 1: a symptom of reduced quality or strength [syn: impairment]
       2: process of changing to an inferior state [syn: decline in
          quality, declension, worsening]