1. North American subspecies of tundra swan having a soft whistling note. 
   冻原天鹅的北美洲亚种，以其柔和的鸣叫著名。
2. swan that nests in tundra regions of the New and Old Worlds. 
   新旧大陆冻原地区筑巢的天鹅。
3. A leaflike thallus, as of a seaweed or lichen. 
   叶状体例如海藻或苔藓的叶状体
4. Of or relating to a lichen whose thallus is flat and leafy. 
   叶状地衣的属于或关于其叶状体是扁平且多叶的苔藓的
5. An algal cell filled with chlorophyll, formed in the thallus of a lichen. 
   共生藻细胞在苔藓的叶状体里发现的带有叶绿素的藻类细胞

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• 1. 地衣冻原
  lichen pine forest 地衣松林...lichen tundra 地衣冻原...liche 地衣类
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