late 13c., agent noun from clap (v.). Meaning "tongue of a bell" is from late 14c. Old English had clipur. Meaning "hinged board snapped in front of a camera at the start of filming to synchronize picture and sound" is from 1940.
权威例句
1. With time elapsing, the flaps collapse up on his clapper's lap.
随着时间流逝, 袋盖在拍手者的膝上堆叠起来.
2. With time elapsing, the flaps collapse on the clapper's lap.
随着时间流逝, 副翼在拍手者的膝盖上堆叠起来.
3. Clapper talk between two people is one type of clapper talk.
对口快板儿是快板的一种形式,由两个人共同表演.
4. You installed a clapper? - No , but catchy jingle, isn't it?
你装了声控装置? - 没有, 不过那首广告曲很好玩对 吧 ?
5. With time elapsing, the flaps collapse up on clapper's lap.