英语翻译a number were silent films with music tracks,or films pr

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英语翻译
a number were silent films with music tracks,or films prepared in dual versions,to take account of the many cinemas not yet wired for sound.
主要谁能给我解释一下a number were 是什么结构,

我查了一下,你这个句子,是一个完整的句子的一部分,原句是这样的：
In 1929 the United States motion picture industry released more than 300 sound films—a rough figure,since a number were silent films with music tracks,or films prepared in dual versions,to take account of the many cinemas not yet wired or sound.
1929年,美国电影产业发行了300多部有声电影——这只是个粗略的数字,由于一些是带有配乐的默片,或者有些电影考虑到很多电影院不配备音响器材的线路而发行了两个版本.
这里的a number 指的是 a number of sound films：一些有声电影,并不是a number were是一个什么结构.

英语翻译a number were silent films with music tracks,or films pr the first two movies were silent films made in 1901 为什么这个句子 Charlie Chaplin（）his silent films Aag lee , Director of a number of excellent films TV programs are l_______books or films?_ 问一道英语单选题At last week's Oscars,a small number of films _____ 英语翻译At frist all films were in black and white,but in 1932 t ___your parents____the films with you?怎么填英语翻译第一次提问,有一段不知道怎麼翻好if light films or oily residues remain o 英语翻译Films,___the one you told me about yesterday or the one The films were on the ground a moment ago .怎么改成同义句? ______are the films?They were here just now.A.Where B.When