Modern cross-laminated timber panels perform better in fire tests than steel ones do.

现代交叉叠在防火测试中比钢性能更好。

This is a piece of a living stromatolite, that I've just chopped.

这是一块活的叠石，我刚刚把它切碎。

These limestone-like carbonates are known on Earth to preserve stromatolites, mounds formed by bacterial growth.

这些类似石灰石的碳酸盐在地球上以存叠石而闻名，叠石是由细菌生长形成的土丘。

And their fossils are often preserved as layered rock structures, called stromatolites.

它们的化石通常存为状岩石结构，称为叠石。

The wavy shapes and textures of certain layers looked similar to other stromatolites.

某些的波浪形状和纹理看起来与其他叠石相似。

Now, what probably looks like a bunch of wrinkly old rocks are actually stromatolites.

现在，可能看起来像一堆皱巴巴的古老岩石实际上是叠石。

The fossils are called stromatolites, and they’re made up of layers of sediment formed by growing mats of bacteria.

这些化石被称为叠石，它们由生长的细菌垫形成的组成。

In 2016, researchers found signs of some really old fossils called stromatolites, which are sediment layers made by bacterial mats.

2016 年，研究人员发现了一些名为叠石的古老化石的迹象，这些化石是由细菌垫形成的。

The kids were playing and I was getting some things laminated -- because teachers are forever laminating stuff -- in the teacher's room next door.

孩子们在玩，我正在隔壁的老师房间里叠一些东西——因为老师们总是在叠东西。

And billions of years ago, these stromatolites, ancient communities of photosynthetic bacteria that are equal parts biology and geology, may have exhaled the first breaths of life-giving oxygen.

数十亿年前的这些叠石，古老的光合细菌群落，它们在生学和地质学中是一样的部分，可能已经呼出了第一口提供生命的氧气。

The shape and texture of certain layers in the rocks, plus their chemical composition, are clues that there are stromatolites made by microbes inside the rocks.

岩石中某些的形状和质地，加上它们的化学成分， 是岩石内部存在由微生形成的叠石的线索。

These calcareous structures — the result of what was a brand-new process, using solar radiation as a source of energy — are stromatolites, constructed by complex microbial communities, in particular cyanobacteria.

这些钙质结构是叠石，由复杂的微生群落构成，特别是蓝藻细菌。这是一个全新的过程，利用太阳辐射作为能量来源。

Layers of sediment can also just build up over time, but the shape and chemical signatures in a stromatolite can reveal if it was formed by microbes.

随着时间的推移， 也会不断堆，但叠石的形状和化学特征可以揭示它是否是由微生形成的。

In a paper published this week, Australian researchers found signs of stromatolites in 3.7 billion year old rocks in Greenland – some of the oldest rocks anywhere on Earth.

在本周发表的一篇论文中，澳大利亚研究人员在格陵兰岛 37 亿年前的岩石中发现了叠石的迹象， 这些岩石是地球上任何地方最古老的岩石之一。