n.a device used in photography to synchronize the peak of a flash with the opening of the camera shutter
英汉双解大词典
synchroflash/ˈsɪŋkrəʊˌflæʃ/
1.
N(名词)
a mechanism in a camera that enables the shutter to be fully open while the light from a flashbulb or electronic flash is at its brightest 快门和闪光灯同步