bourrelet

定心带

词形变化

bourrelets 复数 bourrelets

释义与例句

n.
  1. 1.

    An accurately machined portion around the diameter of a shell of a gun, which acts to increase accuracy of projectile fit to the barrel.

    工程 政治 军事
  2. 2.

    An escoffion.

  3. 3.

    A raised rim around a footprint consisting of sediment displaced by the pressure of the step.

词源

Borrowed from French bourrelet.

来源：wiktionary