antiknock
noun [ U ] uk/ˌæn.tiˈnɒk/ us/ˌæn.t̬iˈnɑːk/
(加入汽油中使燃烧更充分的)抗震剂,抗爆剂
a chemical that is added to the fuel of a car engine in order to make the fuel burn more effectively, so that the engine stops making a regular knocking sound
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