cartridge

1. N-COUNT A cartridge is a metal or cardboard tube containing a bullet and an explosive substance. Cartridges are used in guns. 弹药筒

Only four of the five spent cartridges were recovered by police. 5个子弹壳中只有4个被警方收回。

2. N-COUNT A cartridge is part of a machine or device that can be easily removed and replaced when it is worn out or empty. (机器或装置中可替换的部分) 套筒

Change the filter cartridge as often as instructed by the manufacturer. 要按制造商要求的频率更换过滤套筒。