可数名词：

1.子弹； 弹药筒； 弹壳

2.（唱机的）唱头； （拾音器的）心座

3.录音带盒； 胶卷盒； 钢笔囊

英语解释

ammunition consisting of a cylindrical casing containing an explosive charge and a bullet; fired from a rifle or handgun

a module designed to be inserted into a larger piece of equipment

a light-tight supply chamber holding the film and supplying it for exposure as required

an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable