一个叫“普优西语裔研究中心”的组织专门就这个问题进行研究。
One organization that carries out research on such issues is the Pew Hispanic Center.
但人口普查局这份数据以及近期普优西裔研究中心(Pew Hispanic Center)发布的报告都清楚地表明，涌入美国的外国人数量正在不断减少。
But the Census data, combined with recent analysis by the Pew Hispanic Center, strongly suggests that fewer foreigners are flocking to the U.S..
它具有较高的并行性及较好的普适性和全局寻优能力，因此已在许多科学领域得到了广泛的应用。
It has a high parallelism, a better universal and global optimization capabilities. And therefore, it has been widely used in many scientific fields.
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