clapperboards是clapperboard的复数
clapperboard
美 ['klæpər.bɔrd] 
英 ['klæpə(r).bɔː(r)d] 
- n.拍板
 
复数:clapperboards  
n.  | 1. a pair of hinged boards filmed at the start of each take in a movie and clapped together to help to synchronize the soundtrack with the movie 2. a board consisting of two parts that are hit together before making part of a film, to make sure that the sound and picture happen at the same time  |