weakens

例句:

• Malnutrition obviously weakens the patient.
  营养不良明显导致病人身体虚弱。
  
• " Cousins shouldn't marry, even second cousins. It weakens the strain.
  " 表兄妹不应该结婚, 就是从表兄妹也不应该, 那会削弱血统的.
  
• The burlesque element weakens the serious portions of the book.
  书里的戏谑成分使严肃部分受到损害.
  
• The lack of such data weakens the argument considerably.
  来自SA
• Haemochromatosis weakens the heart, causing heart failure.
  来自BBC
• The memory weakens with age, no doubt about it.
  来自BBC