Many countries are tightening their immigration laws, shifting to a skills-based immigration system and setting citizenship tests for would-be immigrants.

许多国家正在念响它们的移民法紧箍咒，企图抬高准入门槛。 它们要制定一个以熟练工为需求导向的入境体系，且为那些渴望移民成功的外来者设置这样那样的公民资格考试。

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Based on the "guest" beliefs and customs, the Indians gave these immigrants brought the necessaries of life, and teach them to hunt, fish and corn, pumpkin and so on survival method.

基于“来者是客”的信念与习俗，印第安人给这些移民送来了生活必需品，并且教导他们狩猎、捕鱼和种植玉米、南瓜等等生存方法。

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Ting-Chi Wang leads us to the permanent exhibition called With a Single Step. She says that the exhibition about Chinese immigrants in America was based on the idea of a heros travels.

VOA: special.2010.03.03

"We must make it easier to keep critical workers who can keep America competitive and grow our economy, but we should not do so by closing the door on family-based immigrants, " she said at a hearing earlier this month.

WSJ: Crovitz: The Virtual March on Washington for Immigration

There is an annual limit of 140, 000 green cards for employment-based immigrants, so the ceiling means that while immigrants from small countries like Belgium and Guinea have a good chance, the waiting list for citizens of populous countries like China and India can last for decades.

WSJ: Crovitz: The Economics of Immigration

Australia, Britain and Canada are outcompeting the U.S. for skilled people by using a point system based on immigrants' education and ability to invest or start companies.

WSJ: Crovitz: The Economics of Immigration