The walls were all slimy and green.

这些墙布满了青苔，极其黏滑。

A rolling stone gathers no moss.

滚动的石头不长青苔。

Lichen grows on the surface of lawn, can cause grass to be choky and then to die.

青苔覆盖在地面上，容易使草坪植株窒死亡。