Devi skurb related which sport
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I啊呗 哦啊热啊了特点就是我们看到没有啦啦操
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Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together, thus having a mass of four units and a positive charge of two.
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