durain

暗煤 (硬块)

词形变化

durains 复数 durains

释义与例句

n.
  1. 1.

    A type of coal.

    可数 不可数

词源

From Latin dūrus (“hard”) + -ain in fusain; compare French -ain (“-ane”). Coined by British birth control campaigner and paleontologist Marie Stopes in 1918.

来源：wiktionary