这个词是什么意思？
A family of flightless, running BIRDS, in the order Casuariiformes. The emu is the only surviving member of the family. They naturally inhabit forests, open plains, and grasslands in Australia.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D020312 · MeSH 2026。
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