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first reinforce /ˈfɜːst ɹˌiːɪnfˈɔːs/ n

中文：炮尾加固部

中文 · 炮尾加固部Español · refuerzo de la culataFrançais · renfort de culasse
Meaning：The thickest part of the barrel where the powder charge exploded.
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17th-century muzzle-loading cannon and mortar

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