In fact you can find all over American culture in 1800,1810, even into the 1820s, a lot of fear of technology.
其实你能从所有的美国文化中发现,在1800到1810年,甚至在19世纪20年代,充斥着太多对新技术的恐惧
You find it in datable places and that's why we can give this some kind of date, such as in Egypt.
你会发现它属于一个可确定年代的地区,这正是可甄别此文明所属年代的原因,例如在埃及
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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