flashbulb的复数形式怎么写？

n.闪光灯泡...

A dry - cell powered photographic apparatus that holds and electrically triggers a flashbulb.闪光枪一种装有并以电引发闪光灯泡的用电池供电的照相器材....

flashbulb的音标：flashbulb的英式发音音标为：['flæʃbʌlb]flashbulb的美式发音音标为：['flæʃˌbʌlb]...