use of a substance such as oil to make a machine or device operate more easily, or to prevent something sticking or rubbing

Lubrication with gel can help to reduce friction. 将凝胶用于润滑可以帮助减少摩擦。

Supporters say biodiesel fuels aid engine lubrication and cut sulphur emissions. 支持者说，生物柴油燃料有助于发动机润滑并减少硫磺排放。