VOA慢速英语:American History Series: Movies Become Big Business in 1920s

spread out分散

例句：The teacher told his pupils to spread out and not to bunch up in the center of the playground.
      老师要学生们散开, 不要挤在操场中间。

2.American inventor Thomas Edison began making short motion pictures at the turn of the century.

at the turn of...之初

例句：He was born at the turn of the century.
      他是本世纪初出生的。

3.In this way, the son of a banker and the son of a factory worker had much in common.

in common共同之处

例句：We have something in common.
      我们有许多相同之处。

4.Social changes also resulted from great progress in medical research.

result from产生于…, 由…引起

例句：Nothing had resulted from our efforts.
      我们的努力没有产生什么结果。

      His failure resulted from not working hard enough.
      他的失败是工作不够努力造成的。