v.发出咔嗒声；使咔嗒咔嗒地响
n.咔嗒声
The old woman will clack for a long time when she meets her neighbours. 这位老太婆遇到邻居时总要唠叨半天。
I heard the typewriter clacking in the next office. 我听见隔壁办公室中打字机发出嗒嗒的声音。
用作名词 (n.)I heard the clack of her heels on the sidewalk. 我听到她的鞋后跟在人行道上霹哩啪啦响的声音。
