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second reinforce /ˈsɛkənd ɹˌiːɪnfˈɔːs/ n

中文：第二加强环

中文 · 第二加强环Español · segundo refuerzoFrançais · second renfort
Meaning：Part between the first reinforce and the chase and next to the trunnions.
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17th-century muzzle-loading cannon and mortar

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