If we looked in 1950, this is the incidence of paralytic, or the worst form of poliomyelitis in the U.S.

让我们回首一九五零年,这表示的是在美国因脊髓灰质炎,所致瘫痪的发生率

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It's like very 1950's style.

那是50年代流行的款式。

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Because it was in the 1950's or so, maybe the late 1940's, that people started to discover lithium, even though it had no natural function, it did do something in our bodies.

因为在二十世纪五十年代左右，可能是四十年代末期，人们开始发现锂，尽管不参与人体的正常生理活动，但是它确实会对我们的身体产生影响。

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