So human sources — we're talking spies.

我们说的人力资源指的是间谍。

Until now, two kinds of stem cells of human sources have been known: embryonic stem cells and adult stem cells.

目前已知的人类干细胞有两种：胚胎干细胞和成体干细胞。

Numerous human sources tell us that the Iraqis are moving not just documents and hard drives, but weapons of mass destruction to keep them from being found by inspectors.

无数的消息来源告诉我们，伊拉克人不仅在转移文件和硬盘，还在转移大规模杀伤性武器，以防被检查人员发现。

Kelp is good for the environment, because it helps remove some of the excess nutrients that are in coastal ecosystems, often those nutrients are caused by human reasons, human sources.

海带对环境有好处，因为它有助于去除沿海生态系统中的一些多余营养物质，通常这些营养物质是由人类原因造成的。

If any of those planets have life, someone out there could find that there's life back here based on oxygen in our atmosphere, or by radio waves from human sources.

如果这些行星中的任何一个有生命，那么有人可以根据我们大气中的氧气或来自人类的无线电波发现这里有生命。