We have the development of land plants to thank for all the land animals that exist, including humans.

我们要感谢陆地植物的发展，感谢所有陆地动物的存在，包括人类。

And one of the most important things that mosses contributed to the development of land plants is the stomata — those mouth-like pores that allow gases to move in and out of the plant.

而苔藓对陆生植物发育最重要的贡献之一就是气孔——那些像嘴巴一样的气孔，可以让气体进出植物。

Chapters two and three take the reader up to the Civil War (1861-1865), with chapter two focusing on the early development of land and the implementation of a grid system in 1811.

第二章和第三章将读者带到南北战争（1861-1865 年），第二章重点介绍土地的早期开发和 1811 年网格系统的实施。