cathode ray
noun [ C ] uk/ˈkæθ.əʊd ˌreɪ/ us/ˈkæθ.oʊd ˌreɪ/
阴极射线(在一个真空或填充特种气体的封闭容器内,由阴极发射的电子束)
a flow of electrons sent out by a cathode inside a closed container from which the air has been removed or which contains a special gas
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