penetrating oil

短语

词形变化

penetrating oils 复数 penetrating oils

释义与例句

n.
  1. 1.

    A type of very low-viscosity oil that evaporates quickly.

    可数 不可数

词源

Called so because of its penetration into the microscopic interstices of rust and of mating metal surfaces, which aids loosening of fasteners.

来源：wiktionary