单词：lichens
n any thallophytic plant of the division Lichenes; occur as crusty patches or bushy growths on tree trunks or rocks or bare ground etc.
lichens的用法和样例：
例句
- Reproduction in lichens is not well understood.地衣繁殖方式还不清楚。
- A purplish- red dye derived from certain lichens.地衣赤染料萃一种从某些地衣中制取的紫红色染料。
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Goodness knows what the results would be if anyone attempted a similar exercise with the planet's estimated 20,000 types of lichens, 50,000 species of mollusk, or 400,000-plus beetles. 要是有人试图对这颗行星上的大约2万种地衣、5万多
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