People are more familiar with things like tree rings and ice cores or ocean sediment cores.

人们更熟悉树木年轮、冰核或海洋沉积物核等东西。

The scientists based their research on dust samples collected from ocean sediment.

科学家们的研究基于从海洋沉积物中收集的尘埃样本。

By analyzing the remains of sea animals in old layers of ocean sediment, oceanographers can determine the depth of the ocean in the past.

通过分析海洋沉积物旧层中的海洋动物遗骸，海洋学家可以确定过去海洋的深度。

So, researchers have also been looking at ocean sediment cores, which show what’s been piling up on the ocean floor over time, and can be sampled around the globe.

因此，研究人员也一直在研究海洋沉积物岩心，这些岩心显示了随着时间的推移在海底堆积的物质， 并且可以在全球范围内进行采样。

And that’s what this new research did, using data from 59 ocean sediment cores to estimate temperatures over the past two million years – back to the middle of the Pleistocene era.

这就是这项新研究所做的，它使用来自 59 个海洋沉积物岩心的数据来估计过去 200 万年的温度——可以追溯到更新世中期。

In 1980, when Louis and Walter Alvarez were looking at the sedimentation rates, they weren't really interested so much in the extinction of dinosaurs, they were looking at, measuring the rate of sedimentation of deep ocean sediments.

在1980年路易斯和沃尔特·阿尔弗雷兹当时在研究沉积速度，他们对恐龙灭绝并没多大兴趣，他们关注的是，对深海沉积物沉积速率的测量。

This warming may have been caused by the drying of inland seas and release of methane, a potent greenhouse gas, from ocean sediments, Even among these other warm periods, you're making a false analogy.

这种变暖可能是由于内陆海域的干燥和海洋沉积物中甲烷（一种强效温室气体）的释放造成的，即使在这些其他温暖时期，你也在做一个错误的类比。