before 1929,there was no sound in movie.为什么sound不用复数

before 1929,there was no sound in movie.为什么sound不用复数 英语翻译before 1929,there was no sound in movies.the head of one before 1929,there was no s_____ in the movie no sound为什么不加s His lisened carefully,but there was no sound stopped( ),but there was no sound. they stoped ________,butthere was no sound?listening hearing a sound mind in a sound body there were no more mountains in sight.为什么用were 不用was 第三题its不是单三吗》为什么sound不用加s There was no s______ in movies before 1929 ,so people had to the door was open and there was a sound from ＿ a. Does sound travel in water