deteriorates

例句:

• After a few years'planting, the quality of the potato crop deteriorates.
  土豆种了几年之后就会退化.
  
• Virus activity deteriorates in plasma stored at room temperature.
  在室温下储藏的血浆中病毒活动逐渐衰退.
  
• Too often the significant episode deteriorates into sententious conversation.
  太多的时候,重要的插话演变成了一种说教式的对话.
  
• The measure comes as security deteriorates in the country.
  来自VOA
• The accompanying hooey pollutes and deteriorates their mind.
  来自H. L. Mencken
• When respiratory function deteriorates, ventilatory support may be needed.
  来自BBC