这个词是什么意思？
An order of large, long-necked, long-legged, flightless birds, found in South America. Known as rheas, they are sometimes called American ostriches, though they are in a separate order from true OSTRICHES.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D020311 · MeSH 2026。
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