n.地衣；青苔
Caribou eat moss, lichen and green plants. 北美驯鹿的主要食物是地衣、苔藓和绿色植物。
The stone stairway was covered with lichen. 那石级长满了地衣。
The rock is full of lichen. 岩石上长满了青苔。
Lichen is the dominant life-form that covers the surfaces of stones and trees. 青苔是生长在石头和树木表面的主要生物。
地衣类,地衣
