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alpha particle

noun
🔊/ˈælfə pɑːtɪkl/
🔊/ˈælfə pɑːrtɪkl/
 (physics物理)
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  1. a particle with a positive electrical charge that is emitted (= sent out) by some radioactive substances and is identical to (= the same as) the nucleus of a helium atom* α 粒子Topics Physics and chemistryc2