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的年轻DNA片段，甚至是他们实验室的DNA片段已经读长的可能性。

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

研究人员排除这些DNA来自较年轻的种，而这些种较古老的永久冻土的可能性。

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

排除在秩序之外的人都认为是受和不可接触的。

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规定之外，目标是振兴煤炭行业。

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GN-z11的可能性相对较小，天文学家也不能完全排除这种可能性。