onomatopoeia · (onom.) sound of machine gunfire, the ticking of a clock, or the clatter of horse hooves

寂静的深夜里，闹钟嗒嗒的声音格外响亮。

onomatopoeia · used in 嗒然 tà​rán (disappointed) and 嗒丧 tà​sàng (disheartened)

由于计划失败，他显得有些嗒丧。