The footprints were found in plant remains and sediment samples from rivers and lakes.

这些脚印是在河流和湖泊的植物残骸和沉积物样本中发现的。

And sediment samples brought carefully to the surface were found to contain bacteria and archaea.

科学家还发现从深海小心翼翼带到地表的沉积物样本里含有细菌和古代细菌。

They scanned sediment samples using a powerful microscope.

他们使用强大的显微镜扫描沉积物样本。

From Italy: Sediment samples drawn from the Tyrrhenian Sea revealed hotspots with up to 1.9 million microplastic particles per square meter—the highest concentration ever recorded on the seafloor.

来自意大利：从第勒尼安海抽取的沉积物样本显示，热点地区每平方米含有多达 190 万个微塑料颗粒——这是海底有记录以来的最高浓度。

From each of 8 layers, they extracted 100- to 250-milligram sediment samples, using molecular baits to fish for mammalian and human mitochondrial DNA, which is inherited along maternal lines.

他们从 8 层的每一层中提取 100 至 250 毫克的沉积物样本，使用分子诱饵来捕获哺乳动物和人类的线粒体 DNA，这些线粒体 DNA 是沿母系遗传的。