Well, this shows what happened in the period after this vaccine was introduced into the general population so that would have been in 1954.

这表明了,疫苗在一九五四年,引入大众后的一段时间内,发生了什么样的情况

耶鲁公开课 - 生物医学工程探索课程节选

One thing that happened was that after 1956, 1957 the number of cases were down, there was a small bump here, the cases were up.

一九五六年后发生了一件事,在一九五七年,病例的数量有所下降,但在这里却有一个很小的上扬,病例数量上升了

耶鲁公开课 - 生物医学工程探索课程节选

And the problem, in 1968 it was very hard to build a barricade across the Boulevard St. Michel, which was built by Hausmann at this time.

而在一九六八年,在圣米歇尔大道上,构筑街垒都是很困难的,那条大道就是豪斯曼建造的

耶鲁公开课 - 1871年后的法国课程节选

It dropped dramatically in the period from 1954-- this is these filled black bars refer to this axis, polio cases per 100,000 population dropped down to only three or four cases by 1956.

患病率在一九五四年后的,一段时间里急剧下降,该坐标轴上的这些黑色柱形图表明,到一九五六年,小儿麻痹症的发病率,已经降低至每十万人中仅三到四人发病

耶鲁公开课 - 生物医学工程探索课程节选

Here, you've got your basic barricade-- and these things are torn up, these are where trees came out of, as in 1968; and here's your sort of kiosk of modernity, somebody selling newspapers on these boulevards, or near these boulevards, and here's some of these people.

这个就是标准版街垒,这些东西后来都被毁掉了,这些树从中间长了出来,那是一九六八年了,这是一些现代的亭子,曾有一些人在这些街道或附近,售卖报纸,这些就是当时卖报的人

耶鲁公开课 - 1871年后的法国课程节选