clack

• 指两个坚硬物体相撞时发出的短促、清脆而常重复的声音；也指一种单向阀，即铰链在一侧、只允许液体单向流动的简单阀门。

A noun referring to a sharp, abrupt noise made when two hard objects strike each other, often repeated; also a type of simple valve with a hinge on one side that allows fluid to flow in only one direction.

1. Sharp repetitive soundB2informal

   A sharp, abrupt noise made when hard objects strike each other, often repeated.

   咔嗒声

   • The clack of the train wheels on the tracks was rhythmic.
   • She heard the clack of high heels on the marble floor.
   • The clack of the typewriter keys filled the room.

   同义词clangclatterclickcrackrattlesnaptaptick

   反义词quietsilencestillness

2. One-way valveC1formaltechnical

   A simple mechanical valve with a hinge on one side that allows fluid to flow in only one direction.

   单向阀

   • The pump uses a clack to prevent backflow of water.
   • Engineers installed a clack in the pipeline for safety.
   • The clack in the system needs regular maintenance.

• 动词，用于描述坚硬物体相互撞击时发出的尖锐、断续的声音，也可表示大声喋喋不休地说话。

A verb used to describe a sharp, abrupt sound, often made by hard objects striking each other, or to chatter noisily.

1. Make a rattling soundB2formal

   To make a sharp, abrupt, rattling noise, like hard objects striking each other.

   咔嗒作响

   • The old train wheels clacked against the tracks as it moved.
   • She clacked the wooden blocks together to get everyone's attention.
   • The typewriter keys clacked loudly in the quiet office.

   同义词clangclankclatterclickcracklepoprattlesnap

   反义词quietsilencestill

2. Make a clucking soundB2informal

   To make a short, sharp sound like that of a hen or a bird.

   发出咯咯声

   • The hens clacked softly as they pecked at the grain.
   • He clacked his tongue in disapproval.
   • The bird clacked its beak against the window.

   同义词cluck

3. Talk incessantly about trivial mattersC1informal

   To speak rapidly and continuously about unimportant or trivial things.

   闲聊

   • They clacked away about celebrity gossip for hours.
   • Stop clacking about nonsense and focus on the task.
   • The old women clacked over their tea, discussing the neighborhood news.

   同义词babbleblatherchattergabgabblejabbernatterprattletwaddleyammer