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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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Paleontologists have known for decades about the beginnings and endings of a group of dinosaurs known as the Sauropodomorpha.

几十年来，古生物学家们已经知道了一群被称为蜥脚类动物的恐龙的起源和结局。

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Dr.Charles Rabkin and other scientists from the National Cancer Institute looked at gastric cancer rates in the last three decades among a large group of Americans ranging in age from 25 to 84.

VOA: standard.2010.05.12

"Collectively, that group had decades of experience, " said Matt Grzych, who worked alongside Mr. Samaras as a member of the Twistex team from 2009 to 2011.

WSJ: 3 'Storm Chasers' Die in Oklahoma Tornado

South Africa's apartheid government had designated the ANC a terrorist organization during the group's decades-long struggle against whites-only rule.

CNN: Mandela off U.S. terrorism watch list

HTLV-1, an example of the group discovered several decades ago, has already spread around the world, these cases are particularly noteworthy.

ECONOMIST: The American Association for the Advancement of Science