avalanche of positive electrons
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原来这些电子雪崩可以制造出如此之多的伽马射线，其中一些转换成电子和正电子，而这些粒子相继被完全甩出大气层。
It turns out that this avalanche of electrons can produce so many gamma rays that some transform into electrons and positrons, and these in turn are hurled out of the atmosphere completely.
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