lichen
US /ˈlaɪ.kən/
UK /ˈlaɪ.kən/
名词
地衣
a simple slow-growing plant that typically forms a low crustlike, leaflike, or branching growth on rocks, walls, and trees
示例:
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The old stone wall was covered with green and gray lichen.
古老的石墙上覆盖着绿色和灰色的地衣。
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Some species of lichen are very sensitive to air pollution.
某些种类的地衣对空气污染非常敏感。