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I believe powder keg can be used, but context must be added. A person who is a powder keg (like Trump) is someone who is likely to explode at the slightest provocation. A circumstance that is a powder keg is one that may need to be handled gingerly to avoid a big boom. North Korea is currently one of the world's powder kegs.
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Me ayuda si corrige mis errores. Gracias.
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