stem mold

例句：

1. 1.The plant's stem is coveredin green leaves.
   这植物的茎上长满了绿色的叶子。
2. 2. The mold was growingon the roots of the tree.
   霉菌正在树根上生长。
3. 3. The mold spread quicklythroughout the room.
   霉菌很快在整个房间蔓延开来。