If it weren't for the pioneering little plants that got a foothold on land half a billion years ago, our planet might still be barren, rocky, and populated by nothing but microbial films.

如果不是 50 亿年前在陆地上站稳脚跟的先驱性小植物，我们的星球可能仍然贫瘠、多岩石，并且除了微生物膜外什么都没有。