根据中国的数据显示，去年上海有143000外国人获得居住签证。
According to Chinese statistics, last year Shanghai had 143, 000 foreigners with residents' 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;
访问签证到期后他在美国非法居住了5年。
He had lived illegally in the United States for five years after his visitor's visa expired.
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