With only one observation per country, it is impossible to control for unobserved heterogeneity across countries.
由于每个国家只有一个观测结果，因此不可能控制各国间未观察到的异质性。
I myself have often, and unobserved by you, seen you in the British Museum walking about in the depth of thought, and I liked you for it.
我本人常常看到你——在你没注意我的时候——看到你在大英博物馆里若有所思地踱步，我喜欢你那样子。
The trick is to send neutrinos on a shortcut through a fourth, thus-far-unobserved dimension of space, reducing the distance they have to travel.
诀窍在于通过第4维空间即直到目前还未观察到的空间把中微子发送到一个捷径上，以减少中微子的行程。
Apart from the as-yet-unobserved microscopic variety, physicists have spotted numerous telltale signs of black holes that weigh several times the mass of the sun.
除了至今尚未观察到的微型黑洞变体，物理学家已经发现了数倍于太阳质量的黑洞的明显特征。
I'd warn you when I came, and then you might let me in unobserved, as soon as she was alone, and watch till I departed, your conscience quite calm: you would be hindering mischief. '.
我到时，先让你知道，然后等她一个人的时候，你就可以让我进去不被人看见，而且守着，一直等我离开，你的良心也会十分平静：你可以防止闯出祸来。
She contrived to slip away unobserved in the dusk of the afternoon.
她计划乘黄昏时候人不知鬼不觉地溜走。
Widows and widowers speak of the pain of living an unobserved life – of having no one who knows what time they come home, go to bed, or woke up.
丧偶者谈到过着无人关注的生活的痛苦——没有人知道他们什么时候回家，什么时候睡觉或醒来。
When an economy shifts from an administratively determined wage system to a market-oriented one, rewards to both observed and unobserved skills increase.
当一个经济体由行政决定的工资体系转向由市场决定的工资体系时，对于可观察和不可观察能力的回报都会增加。
The turn of the century saw a slowing down of the reward to both the observed and unobserved skills, due largely to the college expansion program that occurred at the end of the 1990s.
在世纪之交这两类能力回报增长的放缓则很有可能是由于发生在上世纪90年代末的高校扩招。
Heisenberg replaced the unobserved orbits of Bohr's atomic model with a series of mathematical entities representing observed quantities, such as the radiation emitted or absorbed by an atom.
海森堡用一系列数学元素来代表被观测到的量，比如原子吸收或发出的辐射，用以替换波尔的无法观测的原子模型运行轨道。
Heisenberg replaced the unobserved orbits of Bohr's atomic model with a series of mathematical entities representing observed quantities, such as the radiation emitted or absorbed by an atom.
海森堡用一系列数学元素来代表被观测到的量，比如原子吸收或发出的辐射，用以替换波尔的无法观测的原子模型运行轨道。
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