咔嗒

咔嗒	kā dā	(onom.) click / clatter
咔	kǎ	(used as phonetic "ka")
嗒	dā	(onom.) used in words that describe machine gunfire, the ticking of a clock or the clatter of horse hooves etc
嗒	tà	used in 嗒然 and 嗒丧