The way to reduce （） is to build up a film of lubricant between any two surfaces that rub against each other.
举一反三
- Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）， so that surfaces dont get touch with each other.
- lubrication A: adding a substance between solid surfaces that are moving against each other in order to reduce friction and wear. B: the process of making the fuel start to burn in an engine so that a vehicle can start to move. C: a force which slows down a moving object or vehicle. D: the force that makes it difficult for things to move freely when they are touching each other.
- These two companies are having a ______ competition between each other.
- When two Maoris press their noses each other, it means that they are fighting or they are angry with each other. __________
- 世界人民相互支持，对抗新冠肺炎。正确译文为： A: The struggle against COVID-19 of the people of the world support each other. B: The struggle of the people against COVID-19 of the world support each other. C: The people of the world support each other to struggle against COVID-19. D: The people of the world struggle against COVID-19 to support each other.