marsupial skin flap

例句：

1. 1.The koala is a marsupial that lives in Australia.
   考拉是一种生活在澳大利亚的有袋类动物。
2. 2. Marsupials are known for their uniqueadaptations to life in the wild.
   有袋类动物以其对野外生活的特有适应而闻名。
3. 3. The discovery of fossils from the age of the dinosaurs has helped scientists understand theevolution of marsupials.
   恐龙时代的化石发现有助于科学家理解有袋类动物的进化。