In the early 1850s, Angstrom, up at the University of Uppsala in Sweden was conducting experiments on atomic hydrogen.
在19世纪50年代的头几年,阿姆斯特朗,那时还在瑞典的乌普萨拉大学里,做了一个有关氢原子的实验。
In the 1880s --a view arose that Los Angeles was just the most wonderful place on Earth.
在19世纪80年代出现了一个观点,那就是洛杉矶是地球上最完美的地方
My bid concern is that you have this huge group of people on the planet 2 young people between ages of say 12 and 19 or 21 or 22 all asking the question: Who am I?
我最关注的是,我们在世界上拥有如此巨大的一个群体,即年龄介于12到19岁,或者21,22岁的青年人2,都在问一个问题:,我是谁?
So if we think about the work function for zinc, and the work function for zinc is 6.9 times 10 to the -19 joules, do we expect that when we shine our UV light on the zinc, we'll be able to eject electrons?
如果我们考虑锌的功函数,它是6,9乘以10的-19次方焦耳,我们是否可以预测当,用紫外灯照射锌时,我们可以射出电子呢?
This went out at the end of the 19th century, and so on.
这在19世纪末期后就结束了。
There was a huge rally in treasury bonds on October 19, 1987.
987年10月19日,长期国债的价格大幅上升
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