The researchers ruled out the possibility that the DNA came from younger species that contaminated the older permafrost.

研究人员排除了这些DNA来自物种，而这些物种污了古老永久冻土能性。

Anyone left out of the order was  considered tainted and untouchable.

任何被排除在秩序之外人都被认为是受污和不接触。

The researchers couldn't rule out the possibility that bits of young DNA in Greenland, or even in their lab, had contaminated the reads.

研究人员不能排除格陵兰岛DNA片段，甚至是他们实验室DNA片段已经污了读能性。

While the possibility of rotating massive star winds being the polluters in GN-z11 is relatively small, astronomers cannot completely rule out this scenario.

虽然旋转巨星光风污GN-z11能性相对小，天文学家也不能完全排除这种能性。

Separately, a Trump administration executive order said it's exempting 47 coal-fired power plants from stringent air pollution mandates, and the goal is to revitalize the coal industry.

另外， 特朗普政府一项行政命令表示， 将47家燃煤发电厂排除在严格空气污规定之外，目标是振兴煤炭行业。