black mud

名词 n.
中文释义

英文释义

名词 n.
  1. Used other than figuratively or idiomatically: see black, mud. countable,uncountable
  2. Reduced mud found below the surface of sediments in lakes and rivers, the blackness of which is caused by the occurrence of metal sulphides. countable,uncountable

词形变化

black muds plural
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