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DNA较年轻的物种，而这物种污了较古老的永久冻土的可。

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

任何被排除在秩序之外的人都被认为是受污和不可接触的。

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

研究人员不排除格陵兰岛的年轻DNA片段，甚至是他们实验室的DNA片段已经污了读长的可。

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

虽然旋转的巨星光风污GN-z11的可相对较小，天文学家也不完全排除这种可。

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， 特朗普政府的一项行政命令表示， 将47家燃煤发电厂排除在严格的空气污规定之外，目标是振兴煤炭行业。