| 单词 | delta ray |
| 释义 | delta ray in British Englishnoun a particle, esp an electron, ejected from matter by ionizing radiation delta ray in American English high-energy electrons ejected from atoms by primary ionizing particles passing through matter delta ray in American Englishnoun Physics a low-energy electron emitted by a substance after bombardment by higher-energy particles, as alpha particles Word origin [1905–10]This word is first recorded in the period 1905–10. Other words that entered Englishat around the same time include: airway, aspect ratio, cadre, overcall, revolving door |
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