antiknocking       
adjective [ before noun ] uk/ˌæn.tiˈnɒk.ɪŋ/ us/ˌæn.t̬iˈnɑː.kɪŋ/
 (加入汽油中使燃烧更充分的)抗震剂的,抗爆剂的
having a chemical that makes fuel in a car engine burn more effectively, so that the engine does not make a knocking sound
  Benzene and many antiknocking additives are carcinogenic. 苯和许多抗爆添加剂是致癌物。 
 an antiknocking agent  抗爆剂 
 See: antiknock
 - More examples
 - The company produces speciality fuel additives including antiknocking agents.
 - To overcome engine noise, antiknocking fuels are used.
 - Antiknocking agents need to be added to low-octane fuel because it causes engine knocking.