空弹壳在射击后从枪里弹出。

Used cartridges are ejected from the gun after firing.

《牛津词典》

他用步枪瞄准，开了一枪，接着排出了空弹壳。

He aimed his rifle, fired a single shot, then ejected the spent cartridge.

《柯林斯英汉双解大词典》

发射的器具，尤指枪里的装置，在每次开火后排出空弹壳。

One that ejects, especially a device in a gun that ejects the empty shell after each firing.

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