deteriorative [dɪ'tɪərɪəretɪv]

例句:

• Senescence may be defined as the deteriorative events which precede the death of a mature cell.
  衰老是成熟细胞死亡之前的败坏过程.
  
• A major concern is to alleviate environmental pollution and restrict the deteriorative tendency the 21 st century.
  进入21世纪以来,减轻环境污染和遏制生态恶化趋势已成为人们关注的焦点.