资料来源 : pyDict

凝灰岩第一流的

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Tuff \Tuff\, n. (Min.)
   Same as {Tufa}.

资料来源 : WordNet®

tuff
     n : hard volcanic rock composed of compacted volcanic ash [syn:
         {tufa}]