In comparison, Shanghai, though has a larger permanent resident population than that in Beijing, it has only 5 million taxis or so.
比较而言，上海的常住人口虽然超过北京，但出租车数却只有5万辆左右。
They are returning because of frustrations with U. S. visa policies that make it extremely difficult for skilled workers from high-population countries to obtain permanent-resident visas;
这些人回国的原因是由于遇到了美国签证政策的阻碍，因为美国的签证政策让这些来自人口大国的科技人才要想在美国获得永久性居住签证变得极其困难；
They are returning because of frustrations with U. S. visa policies that make it extremely difficult for skilled workers from high-population countries to obtain permanent-resident visas;
这些人回国的原因是由于遇到了美国签证政策的阻碍，因为美国的签证政策让这些来自人口大国的科技人才要想在美国获得永久性居住签证变得极其困难；
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