breech-block-thread是什么意思，breech-block-thread的翻译，breech-block-thread音标、读音、用法和例句_開心英語字典

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breech-block-thread是什么意思，breech-block-thread的翻译，breech-block-thread音标、读音、用法和例句_開心英語字典_柠咚词