noun🔗Share边缘发火弹，边缘击发弹。 A type of firearm cartridge where the primer is in the back rim, rather than a central primer cap. They are cheap to produce but cannot be reloaded with powder."My dad uses a .22 rimfire for target practice because the ammunition is inexpensive. "我爸用.22口径的边缘发火弹做射击练习，因为这种子弹很便宜。weaponmilitarytechnicalChat with AIVocabulary GamePractice Reading
