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antimatter

noun
🔊/ˈæntimætə(r)/
🔊/ˈæntimætər/, 🔊/ˈæntaɪmætər/
 [uncountable] (physics物理)
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  1. matter that is made up of antiparticles反物质（由反粒子组成）Topics Physics and chemistryc2