hardground

词形变化

hardgrounds 复数 hardgrounds

释义与例句

n.
  1. 1.

    A lithified seafloor.

    地质

    Ancient hardgrounds are found in limestone sequences and distinguished from later-lithified sediments by evidence of exposure to normal marine waters.

  2. 2.

    A hard stratum of rock other than coal.

    商务 采矿

词源

From hard + ground.

来源：wiktionary