tree moss

例句：

1. 1. The tree mossgrows on the bark of the old oak tree.
   树苔长在老橡树的树皮上。
2. 2. Theforest floor is covered ina thick layer of moss.
   森林地面覆盖着厚厚的一层苔藓。
3. 3. The moss on therocks provides shade for the small animals thatlive there.
   岩石上的苔藓为那里的小动物提供了遮蔽。