moss

Soft green moss covered the damp stones near the edge of the forest waterfall.

(Chinese) 柔软的绿色苔藓覆盖在森林瀑布边缘潮湿的石头上。

You can often tell which direction is north by looking at which side of the tree the moss grows on.

(Chinese) 通过观察苔藓长在树的哪一侧，你通常可以辨别出哪边是北。