Plants first began colonizing the land during the  Ordovician period, about 470 million years ago.

大约 4.7 亿年前的奥陶纪时期，植物首先开始在这片土地上定居。

470 million years ago, in the Ordovician Period, the first plants began to live on land.

7亿年前，在奥陶纪， 第一批植物开始生活在陆地上。

Heading into the Ordovician Period, around 485 million years ago, eocrinoids diversified into thousands of forms.

进入大约 4.85 亿年前的奥陶纪时期，类分泌物多样化为数千种形式。

The Ordovician period also saw the advent of more active suspension feeders, like the giant, filter-feeding anomalocarid Aegirocassis.

奥陶纪时期还出现了更活跃的悬浮式捕食者，例如巨大的滤食性奇虾 Aegirocassis。

This fish lived in the coastal waters of what's now Bolivia, during the Ordovician Period, some 470 million years ago.

大约 4.7 亿年前的奥陶纪时期，这种鱼生活在现在玻利维亚的沿海水域。

These spores were dated to 462 million years ago - during that cooling event that took place in the Ordovician Period.

这些孢子可追溯到 4.62 亿年前——在奥陶纪发生的那次冷却事件期间。

In rock formations in modern-day New Mexico and Texas, they found phosphorus in deposits dating to the late Ordovician Period, when the American Southwest was underwater, and just as plants were getting a foothold on land.

在现代新墨西哥州和得克萨斯州的岩层中，他们在奥陶纪晚期的沉积物中发现了磷，当时美国西南部处于水下，植物刚刚在陆地上立足。