El Popo Gas, Puebla State, Mexico, 1997

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英文注释：

"One of the world's tallest active volcanoes at 17,802 feet [5,426 meters], El Popo is also among the most dangerous. It now expels occasional clouds of hot gases, rocks, and ash but is capable of much larger eruptions whose suffocating fallout can mix with rain and glacial meltwater to form lethal mudflows."

—From "Popocatépetl," January 1999, National Geographic magazine

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