4周搞定2000+托福核心词
lichen
常考释义
n. 地衣（现归入真菌门）
In recognition of their vulnerability, the lichen fields have been marked off on maps and with fences.
人们意识到它们的脆弱，因此地衣区被从地图上标注出来同时也被栅栏围起来。
n. 苔藓（一类发疹性皮肤病的统称）【病理】
Not far upslope were three rounded boulders, lichen-covered, with a hole beneath.
坡上不远处有三个覆盖着青苔的圆石，下面有一个洞。
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