During a period fraught with difficulties and marked by very extraordinary events the United StatesDuring a period fraught with difficulties and marked by very extraordinary events the United States
在充满艰辛和非凡事件的岁月里，我们的合众国还是取得了空前的繁荣。
to be extremely important, so that many ordinary events could not happen without it:to be extremely important, so that many ordinary events could not happen without it:
Love/Money makes the world go round.
to be extremely important, so that many ordinary events could not happen without itto be extremely important, so that many ordinary events could not happen without it
极其重要；必不可少 Love/Money makes the world go round. 爱情／金钱是极为重要的。
Nearly four years ago, a visitor to Brookfield Zoo, outside Chicago, captured an extraordinary eventNearly four years ago, a visitor to Brookfield Zoo, outside Chicago, captured an extraordinary event
将近四年前，一个芝加哥郊外布鲁克菲尔德动物园的游客，用摄像机拍下了一个令人惊讶的事情。
