Low levels of straying are crucial, since the process provides a source of novel genes and a mechanism by which a location can be repopulated should the fish there disappear.

低水平的游离是至关重要的，因为这个过程提供了一种新基因的来源和一种机制，通过这种机制，如果该地鱼群消失，可以重新繁殖该种群。

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"They are worried about the possible side effects, about what they listen to from friends and the Internet because there is no official source.

VOA: standard.2009.11.25

But thankfully now in 2010, we're at the point where there's a whole lot of free and open source software that you can integrate into your projects that other nice people have made available.

不过幸好在2010年,现在有很多可用的开源,代码软件，你可以将其融合,到你的工程中。

哈佛公开课 - 计算机科学课程节选

The source doesn't tell us that, and in fact there's really no archeological evidence of a group, a large group, entering the land of Canaan at this time.

资料来源并没有告诉我们，事实上，并没有考古学证据表明,有一个部族，大部族在那个时候进入迦南。

耶鲁公开课 - 旧约导论课程节选

If there is a cheap and clean energy source out there, odds are someone--looking in the right place--will find it.

FORBES: America's Best Places For Alternative Energy

"There's no known source of caffeine in temperate zones, so there's nothing we can suggest as a sort of alternative hypothesis at this point except for a human source, " she said.

CNN: Researchers find caffeine in waters off Oregon

Other patients were also in the trauma area, separated by curtains, but there were no bombing victims there, the source said.

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