咔嚓
咔嚓 (kāchā) is an onomatopoeia that imitates a snapping, clicking, or shuttering sound. It is most commonly associated with the sound of a camera shutter but can also represent the sound of something breaking or snapping shut. It often stands alone as an interjection in narrative writing.
咔嚓一声,她按下了快门。
Kāchā yì shēng, tā àn xià le kuàimén.
With a click, she pressed the shutter.
树枝咔嚓一下就断了。
Shùzhī kāchā yíxià jiù duàn le.
The branch snapped with a crack.
门锁咔嚓响了一声,有人回来了。
Mén suǒ kāchā xiǎng le yì shēng, yǒu rén huílái le.
The door lock clicked once; someone came back.