With leaves only one cell thick, 叶子只有一层细胞

28. and produce the first ever soil...
    产生了史上第一块土壤
29. paving the way for plants to take over.
    为植物的到来铺平道路
30. Micro plants, like moss, were first to appear.
    苔藓这样的微型植物率先出现
31. With leaves only one cell thick,
    叶子只有一层细胞
32. they couldn't grow upwards,
    它们无法向上生长
33. but could spread out.
    但可以蔓延开来
34. Reproducing faster than lichen,
    它们的繁殖速度比地衣快

来自《我们星球上的生命 第一季 第三集 Life on Our Planet S01E03 入侵大地》第 31 行