令人惊讶的是，根据世界银行的研究，从中国往美国运货居然比从中美洲运货便宜。
Astonishingly, it can be cheaper to ship goods to the United States from China than from Central America, according to a World Bank study.
一些基因和年代测定的研究指出远古美国人可能来自其他地方，而且比北美洲的克伦维斯人来的早。
Some genetic and time-dating studies point to the possibility that ancient Americans came from other places and arrived earlier than Clovis sites in North America.
这项研究得到了美国国立卫生研究院和北美洲的施赖·纳斯医院的支持。
This research was supported by the National Institutes of Health and the Shriners of North America.
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