这个词是什么意思？
A type of climate characterized by insufficient moisture to support appreciable plant life. It is a climate of extreme aridity, usually of extreme heat, and of negligible rainfall. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D003889 · MeSH 2026。
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