superaddition          
noun (also super-addition) uk/ˌsuː.pər.əˈdɪʃ.ən/ us/ˌsuː.pɚ.əˈdɪʃ.ən/
 [ U ]再添加 
the process of adding something to something that has already been added 
  These organisms retain their characteristics with relatively little change or superaddition.
 The super-addition of this infection tends to make the disease more serious. 这种感染的叠加往往会使疾病变得更加严重。 
  [ C ]再添加物 
something that has been added to something else that has already been added 
  The skull is a superaddition to the spine.
 The maximum dose was administered, followed by super-additions every hour. 给予最大剂量,然后每小时进行一次超量加药。 
 - More examples
 - The superaddition of government investment to disease prevention and control will ensure that public services are able to function.
 - The development of the system is characterized by the superaddition of new elements to older ones.
 - There is a continual super-addition of layers during the growth of the bone.
 - These formidable super-additions are held by only a small proportion of orthodox Christians.