When a clock or watch ticks, it makes a sound every second.

（钟表）发出嘀嗒声

The ticking of the clock kept her awake.

钟的滴答上让她睡不着觉。

The only sound in the room was the loud ticking of the clock on the mantelpiece.

房间里唯一的声音是壁炉台上的时钟发出的巨大滴答声。