释义 |
knock-on I. \ˈ ̷ ̷ˌ ̷ ̷\ noun (plural knock-ons) Etymology: knock on : the action of knocking on II. adjective Etymology: knock on : produced or projected as a result of the collision of an energetic particle (as a neutron or fission fragment) from outside an atom with an elementary particle inside < a knock-on shower of particles > < a knock-on atom > < a knock-on electron > |