In Britain, the Netherlands, Australia and many other countries, those applying for citizenship are expected to demonstrate their knowledge of their host society by passing an exam.

在英国、荷兰、澳大利亚等诸多国家，申请公民身份的人都要通过一项尚未，证明他们充分了解并接受了本国的文化。

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It has usually taken several decades for each group to be accepted into the mainstream of society in the host country.

每个群体通常要花上几十年的时间才能成为所在国社会的主流。

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Received wisdom suggests that immigrants blend into the host society, gradually infiltrating the economy until they become socially indistinguishable from natives.

ECONOMIST: Poor whites

That would seem to mean that half of new migrants are marrying into their host society and the other half (presumably) into their own communities.

ECONOMIST: International marriage

The Royal Society will host a meeting in London on stem cell research on Thursday and Friday.

CNN: Call for ban on human cloning